I just saw a set of std 6pak pistons on either the BB parts for sale or the race parts For $100 + the ride. Not sure if used pistons are worth the risk (wait for guys to chime in on that) or what kind of shape thse are in but I wanted to toss it out there. iirc those pistons are very heavy but you can trim the pad on the rod small end (HF has a gram scale for less than ten dollars & it is just as accurate as my buddy's high dollar scale) & you need to get the rod C to C holes horizontally level for a legitimate reading and BB pins can be safely shortened 1/4" off each end with no issues (ex for lathe time) as the pins are bigger than needed even for a racing app so you might be able to get away WO rebalancing. Not sure if any of this is helpfull. Holler how it turns out for you/what plan you decide to go with/how it performs.