ok i have my 5.3 got my pistons on the way selling my dirt bike so now im going to buy parts for my build. going with ls6 pistons and rods. working on getting a z06 cam and springs,oil pump and timming set. still have to get ls7 lifters and trays. going to stick with the 706 heads for now. now on to my questions. i did a little calculating and i believe it said it would be around 10.9.1 comp. does this sound about right with stock thickness gaskets? ive found that there could be 2 diffrent cam bearings for my motor. how do i tell what year my motor is for the correct parts? also ive seen that they list gasket sets for diffrent year motors. whats the diffrence? also will my stock pushrods be enough for the z06 cam and springs? im going to stick with the stock rockers for now. will i need a diffrent length pushrod with the ls7 lifters? im not going to deck anything. staying n/a just a mild street motor for now.