200R4 update

Could the tranny be mounted lower. Say if you had frame ties on the car,could you make a new crossmember/mount that went to the frame ties instead of the torsion bar crossmember and move the tranny mount back and lower to create the required clearance without cutting the upper crossmember?

You must always keep in mind that you have to keep the engine drive line at a certain angle 2/3 degrees (need to double check) running down hill towards the rear. It you lower the back end of the tranny you also increase the angle of the drive line unless you also lower the engine. Now if you put a level on top of your intake (without the carb) and keep that same angle you'll be OK. I have seen some people just drop the rear of tranny and not worry about the drive line angle but this will also effect your pinion angle relationship.
If I remember correctly the engine leans back so that oil will flow back into the rear of the oil pan. But the intake top surface is level (zero degrees) so the carb fuel levels are correct.
PS - you would have to lower the rear of the transmission at least 3 1/2" (approx) to clear the cross member, that's a lot.
I'm sure other folks will make better suggestions...
If you look here you can clearly see how much has to be removed from the cross member to clear the transmission (2004R)
http://www.forabodiesonly.com/mopar/showthread.php?t=252436&highlight=treblig

Treblig