So I bought a used set of 710 cb's to build. I was weighing the heads (after disassembly) and noticed the head weights are pretty far off what they should be. if I order a new set down the road is it possible to order heads to spec weight?

Wanted to re-shaft my 2013 Newport 1.5 and was wondering if anyone knew the shaft specs that I need to order. Any help would appreciated!