Ended up milling the head .45 thousandths bolted everything back up with all stock push rods etc fired right up sounds mean although i need to have the exhaust made from flange down due to changing to driver 340 manifold and passenger Jeep Grand Cherokee exhaust (moved my oil filter adapter to the front due to exit hole dumping towards the back instead of the middle.) I got to say the manifolds look huge compared to the stock ones my motor looks like it bearly fits haha I used fel pro 1008 .39 thickness but I measured it compressed and torqued and I got .30 With a feeler gauge.