You convinced me to go with it. They actually use the same piston as the 331 just with the shorter rods. Speaking of the rods, they also told me that they didn't have the rods in stock but they would upgrade mine to the 4130 I beam Scat rod. I looked it up on their website and it's only around $20 more than the Probe 5140 rods the kit comes with but it has a 5.325 length so the piston should only be down in the hole .010 or so and it uses cap screws instead of through bolts.
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