If you want the car to go as fast as possible go with the biggest port size heads you can get like the Trick Flow 270 or the Indy SR M.W. or 440-1 with the best intake to match the head port size
I have a set of Victor M.W. heads on my bracket motor, I'm not impress with them
The next motor for that car has a set of CNC ported big valve 440-1 with a Jesel paired shaft rocker arms on them
How fast do you want to go and how soon?
Don't forget that the head combustion chamber size and head gaskets used affect the true compression ratio