Rocker arm kit measurements...

I was a bit confused on that one too, using the square, right? Key is the setup the square so the blade is parallel to the valve stem when it is sitting on the edge of the valve cover rail. I was able to speak to Mike directly about it. He got back to me very quickly.

Yes its the one using the square. I did figure out to set it on the valve cover rail. I was up at 3 am yesterday. My brain was mush lol. I read the instructions this morning and they made a little more sense. The valve tip to retainer measurment should be as simple as removing the rocker shaft and setting the square up the same way but resting on the valve tip correct?