No real advantage with that much compression, over say around 15.1 comp but if its together as stated you can run it the way it is, just use the correct fuel. Your wider LSA will help with the extra comp. I would just leave it as is and then on next tear down, address the comp issue.

Diesels run up to 25.1 ratios, fx high rpm 18000 rpm gas motors run 17.1 comp to assist at that rpm. So you are at Top level comp with your motor.

Also, for Just a Bracket motor, you really don't need a 620 ci as well. To me you have a Max built et motor. Send it to me and I will send you a reliable 448 Bracket motor. No Charge.