low buck 440 build questions.

Thanks, I have a set of 3.91s I could run. At this point 3.55 vs 3.91 or whatever, its not a mpg engine:evil4: So Im not stuck on gears. I was thinking about having a custom converter built, but though it would be much more than the converter listed! I can have the howards cam ground on a tighter lobe separation also to bump up cranking compresion, still cheaper than the hughes cam. I have a set of std 69 440 4bbl pistons available that are in real nice shape, would these bump the compression up? I don't know much about the difference in pistons through the years.