Well, I went on GForce transmissions and you can have your T56 built to handle about 800lbft and from what I can tell that is a conservative estimate.
I also found the replacement for the T56 is the TR6060 rated for 600ftlbs from the factory. One of the reasons I was thinking about a T56 was they are more readily available and cheaper than the newer stuff.
Also is there any adapters available to go from Interantional bellhousing pattern to small block ford or even big block ford?
As far as mods I plan better turbo but nothing crazy, injectors maybe a stage 2-nothing higher, better intercooler, headers and up pipes a good 4" exhaust, intake, hotter thermostat mainly for mileage, electric rad fans, regulated fuel return, maybe bigger oil if i need it, switch chip. I think that covers it. Nothing crazy but want to make good power without having a bunch of custom stuff.
I was hoping a T56 might be lighter/smaller and more available but don't know for sure. If a ZF6
has similar ratios it may just be much easier to do that, although I am looking for uniqueness here as well, just not at the cost of money wasting.