New here, I have been considering building a SLC for a couple years, and now I find myself with the time and resources to do it. I know it is probably anathema around here to bring it up, but I think a really "sick" drive train might be a pure electric or hybrid. I have searched these forums and there is very little mention of hybrid or pure electric builds. I live in MA and we have a quite a few people here that are doing Tesla conversions on a number of platforms. They are getting 600+ HP/ 480 ft/pound from a single stock tesla drive unit, conversions are getting almost plug and play now with the new generation of standalone controllers. Pretty sure it would fit in place of the trans on a SLC, leaving lots of room for batteries where the motor usually goes. There are also interesting small 50-100 hp motors that could possibility be made to fit on each of the front wheels, and provide AWD/torque vectoring. I know there has been one electric build a few years ago, and I think Fran has mentioned some in house builds on a few occasions. The technology is progressing really fast at this point, and its probably only a matter of time before with see a dedicated EV "kit" car.
If you hate full EV, another idea I have heard talked about on some EV forums is using a VR38DETT out of GTR, a inline electric motor from a Porsche cayenne or WV turage, mate it up to the Graziano. The VR38 is a short motor ~22 inches dressed, the cayenne electric motor is only ~4 inches long, probably could get them to mate up with adapter plates. VR38 stock is putting out 600/ 481ft/pound (and has a very large tuning community around it) the cayenne motor is 83 hp/ 210 ft/pound. You are looking at ~700 hp/~700 ft/pound with a really flat torque curve.
Anyway, just thoughts. I probably won't go down the electric route for my build, but it really is tempting.
Bob