Converter and gears

Contact any of the quality performance converter builders. Give them all your specs and see what they recommend. Contact more than one to get more than one opinion. This isn't going to be an inexpensive converter, but as I've said before, don't let price be your only guide. Quality does not come cheap.
I've used Neil Chance on my other car but that was a way different animal than this one. Might be a silly question but I haven't seen a lot of big name tc company's like nc , ptc with the molar guys