That carb is to small.
With that said I would break it in on Rotella and then switch to rotella 5W-40 syn or amsoil ACD.
BTW welcome to the 383 stroker club! Mine is a bit wilder than yours but then again mine was built for all out drag racing.
I contacted Holley Carbs, Super Street Carbs, and Demon Carbs. They all told me to run a 650cfm carb, and nothing larger. I went with the 750 AV has reduced flow from a 750 due to the Annular Ventury in the passage, but it is supposed to atomize the fuel better with better low end responce. It has reduced air flow at low RPM's but at WOT it is supposed to flow more than the 650. Since I am going to drive it on the street, I compromised. Of course, I can easily swap it out for the track. It wouldn't be a problem to keep a larger carb just for track day.
Best of both worlds. I Hope.