X3
Exactly my thought also, I have never shimmed a new starter, but always end up adding shims to a cheap rebuild. Hell I even keep shims in my tool box now.
But if your adding shims on one side to tilt the starter to get the starter to engage the flywheel you have either got the wrong starter or wrong flywheel. I’m still not understanding why the starter you had from the 305 didn’t work. I always thought there was only to different sbcstarts, straight pattern and staggered pattern.