You need about .050 on the intake and .070 on the exhaust if you are careful. If you drive like a retarded gorilla, add some in, although I've seen guys with .125 on the intakes smack them because they are just criminals in the way they drive.
Checker springs is my least favorite and the least accurate way to measure actual p/v clearance. If you have say .050 on the intake with checker springs, you probably have .020 more than you think.
The best way is with the cam degreed, and using the springs you be running, use clay to measure actual clearance.
