chris, see my vBGarage...
i used a product that is specifically for joining rubber, (KS Bond) i just used a s*** load of it, and then baked it to half set... then i installed it back on the car, and waited...
your top mounts don't seem to have the same importance in holding the engine from what i can see...
having one top mount broken would probably show your accelerating reasonably hard!!! i'd put it on as a good bet you have broken your front engine mount... watch the way it rocks when you pull the throttle cable!!!