No mike, if you put a 50 oz. flywheel on, you'll shake your engine apart!
You need to find a 28 oz flexplate iwith the correct dimentions of a AOD flexplate. AOD flexplates have a different dish to them or something, but i am sure that it is diffent. You can't run a factory 50oz AOD flexplate because then your engine will be out of balance. There wasn't any made from the factory (at least to my knowledge) so yuo need to go aftermarket. I got mine, brand new off ebay for 45 bucks. Shop around, I know they're out there.
Best of luck, I hope we're all driving t-birds soon,
because it seems like there's a bunch of cars down for the winter, mine included!
Lee