I broke a piston in my 429 and need to redo it. Just looking for a little more horse power. I have a 71 block,stock internals other than a cam and 8012 intake,dove heads unported. I have a set of cj heads that are ready to bolt on. Need to be 514 or under. Truck is a 71 long box unmolested,c6&1356, one tons that are debraked, running a t case brake. 538 gears. We run 44s and a set of 45" v treads. Any suggestions would be appreciated.