440 build questions

I kept the bottom of my 400 stock with 452 heads. Whacked .030 off the block face and whatever the bible says about intake face. .020 steel shim gaskets. Cleaned up the ports a little and put a comp XE268H kit in it. It’s a little smaller cam than yours, and 40 ci smaller, but it seems to like the set up. If I were to go back, I would have added flat face valves. Not that I really feel the acorn sized voids steal all that much in terms of CC, but it adds up. My 440 on the other hand has trick flow 240s with HS 1:6 rollers and TF track max cam. Bottom end not stock, but regular stroke