Well I have a stock 302 with windsor jr heads, an f-cam , with all msd electronics, dist, coil 6al box, wires. I'm pretty sure I know the answer but i want to make sure i know why my engine has no compression. I guess for peace of mind. i installed all of the above car ran flawless ,seriously,after about a month or so, i went to re-adjust my roller rockers which are the 1.6 ratio, i have done research for two weeks now concerning this problem (thats how i found this very informative site and registered). I've read on other sites where guys are saying you dont need to measure p2v clearence, with this combo and others say you do. To be honest i didnt measure thats why im where im at now. I believe i have bent a couple of valves, reason for no compression on all 8 cyl. Please reply and see if im right, like i read in this forum, measure and be one thousand percent sure, than 50 percent not sure. Now i can build the 331 stroker or 347 not sure yet still debating, very hard decision, And take it from me, take the freakin time to measure, then to end up with your ride just parked in the driveway looking good with nowhere to go!!!