383 recipe

Guys, I'm looking for some input on an upcoming 383 build. Its a 1965 that will be going into a Newport 4dr sedan. I believe it is a factory 2brl.

I know their was a compression drop in 65 and a resulting lower hp. Was this do to changes in the heads? Or did they go to a dished piston?

I intend to run the stock heads as they are brand new. Factory cast iron 4 barrel and an Edelbrock/Carter carb. I have all the carb variations to choose from, in that platform.
I have a few random Holleys...

383 recipe