Doing some looking around last night, and the M113 is getting fairly inexpensive for a sub-100k mile take out. I've seen a handful of examples of folks having good luck with the 6-speed manual out of the Crossfire, since it all bolts right up. Seems to handle the torque okay as well, at least on the naturally aspirated motors. I'm not looking at smoking people off the line, so NA is more than okay with me. Baseline MS tunes are out there for the M113, but I wouldn't be adverse to keeping the stock engine management if I had an entire, running donor vehicle to transfer everything over.

Hmm, never thought about the 722.6 bellhousing. Like the Mustang T5, the 280ZX T5 has a removable bellhousing but yeah... ratios.

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1984 500SE
1985 190E 2.3-16
1997 Jeep Wrangler
1998 Dodge Durango SLT 5.9
1951 170S
1996 Ford F350 7.3 ZF5 swap