Yeah I use a dragy. I can't really recommend a tuner for you because I noticed as you have that there isn't much aftermarket support for your car. However I do know tunes exist. As you have said, finding any data on the m760 is hard. On dragy there is a guy in moscow who went 10.7@130 with a tune, downpipes and 100oct.
Its really a shame because I think these v12's have potential. But if you look at it from a tuner/parts manufacturer pov those engines came in one car the m760 so I think a lot of the tuners pass them up.
The 740 is hard to find info on too. Luckily for me almost everything that fits on a 340 or 540 fits on the 740. And the 340's only started getting real attention from tuners because of the supra.
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