1st let me say, that sounds like a really neat project. I hope it turns out well.
I am currently in the planning stages of a build (I have a 228 GMC, I may come up with a 270 or a 302) myself. I would like to boost it (I have some turbos and a blower). Unless I found a shelf stock piston that would work without modifying it (resize, fly cut, whatever) I would go custom anyway. Then again I am in Alaska and from what I've seen the machine shops charge more here. So any machine work to the piston (times 6) would likely offset the savings of a shelf stock piston VS custom.
As for brand I'm partial to Wiseco, that's why I'm a WD for them. Please don't misunderstand all of the brands mentioned previously definitely know how to make good pistons. I'm just speaking of my personal preference.
