383 build help one piece at a time

First, a 383 in an A body should be able to light them up any time. The trick with 383s is the piston and cam choices. The pistons - I like the KB hypereutectics. Close to zero deck, able to take some abuse, but you want to be careful when the guy hones the block to get the right (tighter) piston to wall clearance, and you want to make sure you set the ring gaps per KB specs and your worst intended behavior. On the cam, too small won't hurt. Too large will. Depending on the heads and deck height and resulting compression... It it's over 9.5:1 keep the cam smaller than 225° @ .050. If it's higher than 9.5:1 go with something larger than 230° @ .050. I'd also agree on the larger exhaust valve, and have the exh bowl blended to take advantage of the larger valve. This is very basic, but you get the idea.

Edit - Thanks to SG...
In order to get a 383 to 9.5 or above static compression with the KB pistons you MUST blue print the block, and MUST mill heads to reduce the chamber size. This also will mandate custom length pushrods and milling to fit the intake manifold properly.