Any advice on my 440 recipe?

As everyone has said wrong cam and wrong pistons. If you really have to re-use the pistons just run it with a stock cam till you get the coin for a rebuild. With that cam and pistons and converter you will just have no fun.
For $375 i don’t have a problem going with new pistons. Learning to calc compression ratio has actually been fun. But I apparently need to go back to the drawing board on the cam now too.