I have a 64 292 want to start a rebuild cylinder heads first then the short block.
My question is would I be better off having the stock heads rebuilt new valves and guides 3 angle job springs shimmed .015" etc. possibly add stellite seats for unleaded gas. Mill .030 for 8.5:1 compression
or
Order a head already remanufactured for a 72 292 would this have the hardened valve seats? should also have 72cc combustion chamber vs 74cc on the 64 heads. Possibly milled for ~8.75:1 compression?