Man, just Double and Triple Check EVERYTHING if You are gonna go Custom Pistons, off the shelf, i would still Have A KNOWN Good Engine Man/ Machine Shop VERIFY ALL Numbers, ie: wrist pin height, comp height, wrist pin size, material of Pistons considered, fly cut/ valve reliefs needed, final bore size needed ( will yer block take it) MAN, just please Do Yourself a Favor Brother, I ain't trying to rain on your parade man just make sure you or someone that knows what they're doing takes everything into consideration before you start spending a dime.... life WILL be Better and Less Stressful! It always takes me a year or two to build a motor. Due to Research and Money. I have time to research... I don't have money to screw things up