I'am building my 4.6 back with stock 96 cobra flat top pistons with flycuts. Also installing Comp 278's. My problem is that when I'am trying to degree them I can't even get through a whole revolution without the intake valve having PTVC. What piston combo can I use so that I don't have any PTVC. Any help would be great as I need my car running in two weeks for beach vaction. Thinking about buying a set of stock cams because like an idiot I sold my stock stuff, just so I can put it back with no issues. I would rather use the Comp cams, Help!