Block out of square

Before you do anything , take the tranny bell to a machine shop (not an auto machine shop) that has a precision granite plate and have the tranny bell checked for parallel to eliminate is from this exercise . If that's o.k. then it's in the block and it can be corrected in 20 minutes by a Strom-Vulcan Blockmaster . Check it again afterwards . Don't accept anyone's word that it's o.k. You have too horsepower to accept that tolerance and too much $$ invested to risk engine failure . good luck