alright from scratch what I have is a set of NIB Manley 3/8 2.14/1.81 valves, a pair of bare 915's. a pair of bare blasted 452's a pair of cruddy 452 take offs complete. A 451 coming together and a 535 RB next (have block/4.5" crank). Top priority right now is heads. The KB pistons have the tall machinable dome & no idea where my height is going to fall but want to run pump gas & definitely want .040" quench. Double R I had just assumed that if the dia is not an issue and can ream the guides then I assumed the height would be the same/close. The "supers" have seats/guides installed & I'd have a guy ream the guides and I'd port them myself. That's the plan stan (so far). I'd think the larger supers would be the way to go unless you guys persuade me otherwise