JW makes a ultra bell that requires the removal of the damaged area on your trans shown in the photo. The new bell housing bolts directly over the oil pump and requires longer fasteners and stato seals on the bolts and you would be set. The housing is SFI approved and does not require any other additional shielding for the flex plate. They sell new for about 150 bucks or so and have all possible bolt patterns available. This is how a ford could use a GM 400 or..... Just thought I would point out the simple fix potential.
You know how you broke it right? If so you might have a clue what you may have damaged in the case internally. Pump bushing etc. Be sure you address what caused that failure prior to replacing with a new piece reguardless which way you go. And for the record, lots of Power does not do that, A twisting chassis or ridgid engine and trans mount in a flexing chassis could be in play.
sorry I took so long to type it appears every one already knows this. did not mean to be redundant.