looking for cam and pistion ideas.

I have always liked the 213462 JE pistons at about 10 to 10.5 to 1 and have had great luck with them in my big blocks. I always call and talk to the tech. line when it comes to my cams, but I run this cam in my 1972 Challenger and I have been real happy with it. I is an old style Pro-Street tubed and frame tied 727 with 3000 rpm stall, 904 with 2.14/1.81 with very little work done on them (clean up). Comp cam 21-232-4 RPM Range 2500-6500 .520/.540 lift Duration 282/290 @50 244/252 Solid lift. I think your LY’s with harden bolds would be fine for your rods. I was told once that if you are building a big block mopar you need to do pay attention to three areas, rotating weight (Stock pistons 857.5 grams / JE piston 613 grams = 1956 gram weight loss, 1lb is 453 grams that is taking off 4.5 pounds off the rotating assembly). Heads (he said for high HP aftermarket heads only), and cam selection (self-explanatory). He seems to right for the most part, but I do know I have seen some very fast stock headed mopars so I guess you will have to weigh the cost of the heads rebuilt vs new or good used. I do agree with 70aarcuda on the gear choice, it is a bit deep, 4.30 with 29 to 32’s on the tires would be much better. Good luck and let us know how you do