Paul, Im using Edelbrock 60679 75cc heads, along with their head gaskets (.048 thick torqued) ARP head bolts tqd to 137#s, and Id post pic of the valve tip line if I knew how on this site- the line is about 1/3 of valve tip wide, centered. Installed height, I do not know- can I measure with stick end of caliper? Where to where? I did read Comp's article prior to doing the measurement- also, the machine shop barely removed any surface material from my block- DIVE-6015-A2B. Id have to measure, which I can, the piston to deck- maybe an 1/8". Rockers I purchased some years ago, still new, Ford Motorsport, marked A460. I'm always up to learning, and the help to avoid a catastophic mistake is greatly appreciated.