WTF Big issue

I had slow to no cranking issues last year. Replaced my mini starter then found issue was a bad engine to frame ground and fixed. I had dizzy out thinking it may have been a timing issue. While out I went thru the Dizzzy adding a limiter plate . When I tried starting it the motor kicked backed hard and cracked my starter nose. When it did start I set my timing. Then I replaced starter again . Motor kicked again broke the starter and 2 teeth on the torque converter. Now I have to find what's going on . Not the timing chain. Maybe something with dizzy I messed up. Not a happy camper. 440 with 500 440 source with Eddy heads. This is how it sounded before second starter change. Now how to approach. I'm sour !