Coast High Performance is a good place to look. The KB forged pistons are supposed to be good quality but you might want to call them because I was gonna build a P-51 headed deal and the pistons even though stock stroke used a 6.8 inch rod which is an oddball with the Ford 2.5 inch rod journal but to my surprise there are a couple companies that do make them. I believe it was Scat and Eagle that make them. There is always custom rods but the prices are very high for them.