I worked with Chip at Ohio Crank and am very happy so far with my 451. I would give them a call and see what stroke/rod combos they have available (way more than what's listed on their website). I was able to pick the Piston (Diamond with 1 free spec change), the rings (gapless) and the bearings I wanted without issue. He worked with diamond to find a Chevy piston that saved me from having to deck them for my compression height. Paid for the kit, had it a few days later.