What ET range are you shooting for? Do you prefer pump gas/ race fuel or E85?

The answer to that can help decide on your piston/compression choices.

Looks like your car is setup for full race/non street.

As stated by GregsDart, you can build a stroker 400 block into a wide spectrum of performance.

You can build a Pump gas motor that will get you in the 9.9s/9.7s 1/4 6.3s/6.1s 1/8

Or Alot faster with Race fuel motor with more comp. 9.0s/5.7s 1/4/,1/8, mile your call brother.