Rubber mounts are for pussies.
ok, i welded up some motor mounts today. the pics look like crap because i took them about 2 seconds after liberally dousing them with flat black spray paint.
I basically welded them right to the frame rails of the car. There is a relatively large backing plate of 1/4" mild steel solid welded to the frame rail, then gussets made of 1/4" and 7ga mild steel holding the motor.
Compared to the stock mounts, this would probably hold a bridge.
Front Driver
Front Passenger
Back Driver. (you can see the backing plate in this pic)