Just noticed they're not making hyperut pistons for the 429 anymore. So, your limited to flat top forged units (custom cut dish) or stock cast pistons. Assuming you won't be racing then Sealed Power 413ap/cp will work with the DOVE heads 72cc. They have .120 dish which will have a 10.5:1 CR if .040 below the deck and .040 thick head gaskets. That's still to high for a tow/hauling truck. The afformentioned 1973 police interceptor heads would kick it down to about 10:1 with 80cc chambers and 9.5:1 with the D3ve heads 95cc. If you find a set of P.I. heads make sure they're not the standard police cruiser heads. think they are d3ae-fa castings.