Have a flywheel made by SPEC in Birmingham, Alabama with a 10.5" Ford or
11" Chev bolt pattern and use a ring gear from a MB flexplate. Then find an old AT tranny to tear apart for the case, cut the back off and save the bellhousing area.
Machine that flat and weld a 3/4-1" plate to the housing and machine it to accept whatever tranny you want to use. You can then use your OE starter in the proper position and an inexpensive, easy to find clutch parts...in fact use the SPEC clutch, they're great. I use one in my 354"/ 440hp 190!! Pedal clusters are easy to come by and use a hydraulic TO bearing such as McLeod or Tilton.
This is the way that Sainz trannys from S. America are used/mounted in SCCA race cars.

Good luck,
TobiasMB
190-/5.8