For those that have installed a 200r4...

You can lower the back end of the transmission but there is a limit because as you lower the back of the transmission you're forcing all the oil to the rear of the pan and the rear of the engine. Then when you "launch" the car the oil in the engine and the trans pan get forced further towards the back. Normally an engine will sit at 2 to 3 degrees down towards the rear, this helps the oil flow to the rear of the heads (rocker valley) and back down to the pan. If you can lower the front of the engine it would solve most of the problem. As far as pinion angle is concerned.....you can adjust the pinion angle no matter what angle your drive train is at. The pinion is normally set at 2/3 degrees lower than the angle of the drive train, when you accelerate the pinion will rise coming into to alignment with the driver line.
If you lower the engine you can also crank the torsion bars so that the front end is higher giving you more street clearance.

Treblig