I understand you don't need pistons, I think. But there's been a few part numbers listed here withe the 2315f being the tallest.

FWIW Ross has an NHRA piston for the 383. It's listed under their custom pistons, but it can be made as tall as needed along with any mods you want.

I have a set in my stocker 383 purchased about a decade ago under $700. I don't know what they would cost today. I had them made to NHRA specs.
Part # 74233