Let me "pick your brain"

[Kalums]

Ok ladies and gentleman, here is a head scratcher from me. 1971 GMC K2500, with an 90s "target master" 350. When I first got the truck back in July it made a horrid grinding noise when ever you engaged the starter, found the starter bendix was eaten (not toothless just very worn) and the Flex plate had a few teeth with the tips missing(one spot of about 5 teeth) I've replaced the flex plate and starter both new AcDelco. The starter was already "upgraded" to the 90s style with 2 wires, but I have an older style that fits but I would need a new solinoid. I digress, it has since then starting fine, no grinding or whiring. Well I redid the distributor after I caught it on fire( ended up being a crack in the distrubutor caught the carb cleaner on fire) and fried some wires. Rebuilt it with All AcDelco/GM parts (didn't replace the coil). I tried cranking it when I had the dash out and it cranked fine, but I got no spark (obviously) finished putting the dash back in went to crank and got the same grinding, clunking, whiring.... Any ideas? To sum up started fine before distributor rebuild (with spark) and after without spark... Now with spark it makes horrendous noise... Thank you in advance.

**SOLVED** Apparently something shifted or wasn't tightened correctly in the first place and I needed shims for the starter, Everything is copacetic again.