It’s going to get a 572 and discs in all four corners. Doesn’t matter what the current engine looks like. 

No proportioning valve? Drove a '72 Dart for years to the late 90's and never felt it unsafe or lacking braking power, and it had manual brakes.A previous 1957 owner here…
the 4 wheels have equal braking force, or mine did. Fronts dishes out just as much, and no more than, the rear.
That’s right…along with a dual master cylinder a proportioning valve can be added.No proportioning valve?
Correct. No proportioning valve. Single circuit to all 4 cylinders. Big ‘ole drum brakes on every corner, manually adjusted. Oem service interval was 1000 miles for brake tightening and chassis lubrication Iirc. if you didn’t adjust the brakes regularly, the pedal would indeed run out of travel. Generator and distributor bearings were also on the frequent flier list for a squirt of oil into their pop-top lubrication tubes.No proportioning valve? Drove a '72 Dart for years to the late 90's and never felt it unsafe or lacking braking power, and it had manual brakes.
The front wheel cylinders have 1-1/8" bore, and the rear wheel cylinders have 1" bore. I always thought it was this way to make the front brakes a little stronger.A previous 1957 owner here…
the 4 wheels have equal braking force, or mine did. Fronts dishes out just as much, and no more than, the rear. The rears would lock up long before the front would reach full potential. You were truly limited in how much brake force could be applied before the rear locked. I …slid… through an intersection one day at 35 mph because I jabbed the pedal for a yellow light. Did it right in front of a police car. Of course he came up to my window. He said, “I saw you trying to stop it from an appropriate distance, and it just wouldn’t. please make sure you get a feel for this one and leave more room.” I was grateful for his kindness as my heart thumped through my chest AND I didn’t hit anyone.
It’s been a while - if mine were a different size I never caught it. I did absolutely learn that the back would lock up first, and it just didn’t stop anywhere near as well as everything else I was driving in the 80s along side it. ? ?The front wheel cylinders have 1-1/8" bore, and the rear wheel cylinders have 1" bore. I always thought it was this way to make the front brakes a little stronger.
It has no a/c.The body spears are all there......
Do you hang an aftermarket AC under the dash or go original?
So much street rod stuff out there.
Share more history details! Was it left out in that field for 25 years? Who was the first owner? Why’d you park it?It was running when I parked it. That was 25 years ago. It would need a new fuel tank and clean the carb.
The clutch is rusted , so it will need work or replacement.
The other neat fact is;
I'm the second owner.
I bought it from the original owner, who was a college professor.Share more history details! Was it left out in that field for 25 years? Who was the first owner? Why’d you park it?
This is one of those rare unicorn examples where a car turns out to be a great investment!I bought it from the original owner, who was a college professor.
I drove it around for a year or so. I realized it was not safe for my infant son to be in, especially with the original brakes. I parked it under and open carport. I had intentions of restoring the car, or making it a resto mod with a modern drive train. Life happens, i worked a lot of hours over the last 30 years, and i still do. The car fell out of my focus as my time was split with family and job.
I now have to decide what to do with it.
Engine ran fine when parked 25 years ago. Lower end bearings had been replaced by the original owner.More importantly, did you check the oil and see if the engine is locked? It's really not that bad and almost looks drivable.
Does it even have an oil filter?
i think its 12v, but i will have to look, i can't remember.I'd bet that as long as water didn't find its way in the engine, which I doubt it would have since the hood was on...it will spin fine.
Maybe take the plugs out and soak the pistons in a good detergent/lubricant like 50/50 diesel and ATF. Let it sit for a couple days and keep adding to it every now and then. Drain the oil and put some fresh stuff in there and take the belts off. Spin it by hand with the spark plugs out just in case there is some oil left in the cylinders.
Is this a 6V or 12V electric system?
Yeah, Chevy went 12V in 1955.i think its 12v, but i will have to look, i can't remember.