After reading this:
https://www.cjponyparts.com/resources/t-45-transmission I'm not sure if it would be worth it unless you find a later-model one or one that's already been gone through and update. Ratios are kinda wide for my liking as well, 3.37:1 first is pretty deep. If you can get one cheap it's worth a shot IMO. But then you gotta add in all the conversion parts; clutch+linkage(hydraulic), shifter, trans crossmember, also not sure if there exists a bellhousing to mate to a SBM bolt pattern.