if you scroll down the the page a crank rebuild, true and weld from F.A.S.T should be under 2hundo not sure about turn around though
http://www.farmandsandtoys.com/services.asp
it wont be just your piston that got fucked, everything in the bottom end took that deto, even if it feels ok and specs out all the bearings might as well been hit with a sledge hammer, that cranks life has been shortened drastically