I looked every where for an easy way to check for you! With this video, you and that tool, you can check if your push rod length is right or not!! Its very easy!
myvintageiron7512: How to check for correct rocker arm geometry : when building any engine rocker
This is the push rod length checker pic! It didn't load on the first post! LOL Its very easy to use!
Proform Parts 66789 - Proform Pushrod Length Checkers