Valve Clearance on Larger Camshaft and Flat Top Pistons

You'll be fine Fish Bite.

How to check piston to valve clearance

My combo - 263/268 @ .050" solid roller with .665" valve lift, advanced 4º. Diamond shelf flat tops with a -5cc or so valve relief and a Cometic .039" gasket. I don't remember the exact number I got but it was basically double the minimum clearance.

I tried the clay method at first but could not get it right. Not sure what I was doing wrong but it turned out using the degree wheel was actually easier and is 100% accurate. Cam should be degreed first.