The Miata engine is a 1.8 with a slight overbore and custom cam so I'd probably have to go easy if I used a H150. In the end I'm expecting ~170HP though I'm not sure on the torque number.

The other part I forgot to mention is part availability. I know in the wiki it says Ford Rangers fit when shortened, but after 6 months of looking I have been unable to find the holy grail AX R6, axle tag 3L73 4x4 4.10. I've found other axles that could fit great in theory but again can never find the right combination for sale. AE86, Celica/Supra, Volvo 1800, Volvo 242, RX7 GSL-SE. They can all work but I could never find the right combination of LSD, disc brake and a higher end gear ratio.

At this point I was just looking for other possible options that I might have missed so I can get this thing going. Money isn't the issue although I'm not going to just spend like an idiot. I did research a full custom rear end from MADDAT or Curry but the prices are insane.

Thanks for helping with the brainstorm...I'll keep looking!