402 engine rebuild

[ho70]

OK.......Rebuilding my stock 402 for my 72 C10.
Want 9.5-1 compression, added 6223 forged crank, 2162 performer cam, performer 4711 carb and matching intake
I have two sets of heads
781-stock off LS5 270 hp, oval port 113cc
292-stock oval port
both 2.06/1.72
Machine shop states use 292 as smaller chamber easier to get compression
I just want to confirm these are OK heads as they were the stock ones on the truck, but don't want to go against machine guy to piss him off unless absolutely necessary
Also, will I need a new harmonic balancer as I have old one from cast crank and using forged crank.
Want a nice strong 402, not a race engine nor a dog. Anyone done this what pistons did u use?
thanks