Hey guys. Long time stalker, first time poster. Im building a 71 chevelle ss 454 block into a 496 stroker. Running forged rotating assembly, comp cams big muthr thumpr hydraulic roller cam/ spring kit. 049 head, new valves, stock sizes just new valves, seals, comp titanium springs. Any way my question was im running 18cc dome pistons what headgasket thickness should i go with. And Fel-pro VS. Cometic. Im running arp Head studs and eventually a weiand 177.