Don't take this wrong Randy but you don't have a 572 motor with aftermarket block and some of his higher dollar parts either. You can build a 440 or 500 cu motor a LOT cheaper then 20 grand so your motor and his are totally different in cost etc.
I am Not taking sides on this but trying to look at it both ways.
I wouldn't be Happy if my 20 grand motor went south so soon but
I also would have tried to let MM make it right first before I spent another 7 or so grand again.
I have gotten parts and a LOT of advice from MM and Appreciate all they have helped me with.
I agree that the motor should NOT have had that many issue coming from MM either if all is correct in this post.
Stuff Happens Sometimes, We are Not All Perfect.
David