It' easy to measure the "clearance ramp" using a set of V blocks to support the cam and a dial indicator. The area of the lobe just off the base circle will have a short area of gradual lift before the valve lift actually begins. Measure that slow lift ramp and set the clearance accordingly. Don't forget to factor in the rocker arm ratio in the process of measuring the clearance ramp. It's much simpler to do the math with the cam installed in the engine and a degree wheel on the crankshaft. Position the dial indicator on the rocker arm tip directly above the valve stem.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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