I check the allingnment previously. I've cleaned the threads used a stud for the top with nyloc nut and she is a snug fit.
I was running a low comp 440 previously for 10 years and the starter was fine. Same gear box too
I thought it was also my optima battery was too small however a larger battery still didn't fix the problem
When I turn the motor over without spark the starter spins nicely
My dizzy isn't locked either
So I'm assuming it's the starter not strong enough