I think you have a lot of good high horsepower parts to stick on a junk 350 with no compression and no power handling capabilites if you somehow could make it run.
Cam too big
heads too big
intake and carb too big
Don't do it. It will be a dog and you will be angry with yourself for it.
Wait until you can buy some decent pistons. Watch ebay. Thay sell good used forged pistons there all the time. Even a KB Hypereutetic would be better. Much better.
What do you mean by a cast 383 crank? If you mean a factory 400 that is cut down. IF it is go for it. That is a strong crank. if you are talking about an aftermarket cast steel crank I would be scared to do above 500 hp with that.
You have a biunch of parts that were designed to work well with a good strong higher compression engine with some rpm.
You are wanting to put race car heads, cam, intake, carb, etc onto a stock short block. Not a good match.
You will have to really cut some deep valve notches in those thin cast pistons for even your cam. It will cost almost half as much just to get those POS pistons cut as a new set of Hypereutetics would cost. They might not clear either.
I hope no one comes on here and encourages you to put all this stuff together.
Ed