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Thanks again to all. Car restoration has a ways to go before ready to hit the road. With plans to drive year round, Mobil 1 HM or Amsoil's Z Rod are two top contenders...as of 0945 on Sunday Feb 22, 2015. Plenty more time for me to obsess over this!

Appreciate the dialogue. Drained off the Brad Penn IAW my machine shop's direction...it was the zinc enriched 30W designed only for the break in run of 30 minutes, not beyond that. The Dino oil was also at the direction of the machine shop (same direction given by GM for Chevy/GM crate motors)...

Running Edelbrock Performer package, 58cc heads, .40 over...making approx 350 hp. Believe it's built to last, just navigating through the various oils for the right one. Thanks.

Just broke in freshly rebuilt 350 for my 55 Chevy. Drained off Brad Penn break in oil and refilled with Pennzoil Dino 10W-30 for 500 mile break-in. Looking for best oil once 500 miles are up. Flat tappet cam, so want to feed it a zinc-enriched oil and noticed Mobil 1 10W-30 High Mileage has high...