Solid mounting is easy. Use the 3 replacement solid mounts and a rear engine support or an Airspeed drag bar and you are done.
Rubber mounting is a serious challenge. Where's Lanny on this topic. His car has always been rubber mounted.
Use the 3 stock rubber mounts, plus a Berg style intermediate rubber mount. Then an Airspeed drag bar, and a rear engine hanger, with a rubber block between it and the case.
Urethane trans mounts transmit a lot of noise. I'd say closer to solid mounting than rubber mounting.
Many forget the suspension grommets. To prevent wheel hop, install urethane grommets on your torsion bars at the spring plates. Using urethane here does not increase noise at all.