Measuring for custom pushrods

The only thing I was unable to do is check piston to valve clearance. SUPER hard to accomplish an accurate measurement while the motor is still in the car. I am running a bit bigger valves, and I know I was cutting it close before with the closed chambered heads. I installed a set of 906 open chambered heads and a thinner gasket so I knew that I was ok. Just got done breaking in the motor. I had quite a bit of valve train noise but that was to be expected with new lifters/cam and it was my first time with adjustable rockers. Quite a learning experience I must say!