soo i recently rebuilt my engine, weisco/eagle combo on the block,fp2 cams and crower springs/retainers, mls head gasket, nothing was shaved when i did this headgasket, but car ran for 600 miles then kicked the bucket, when it was running it would take a couple turns of cranking and me feathering the gas peddle when it finally would start it would stumble and sound like only 3 cylinders were firing, but once i would rev it up white smoke would come out,once it warmed up it did fine no smoke while i drove??? i was thinking it was the headgasket, turbo spins fine,minimal shaft play, cant really think of anything else, anyone have any ideas?