I have the polyurethane engine mounts that Rodney is making! They are awsome and I would strongly suggest you take a good look at them!
I have SPF1676 with a Dart based 427stroker putting out over 500hp.
I dont get alot of engine vibration and no engine movement.
If you have any questions, I'd be more than happy to send pictures or talk to anyone about these mounts!!
Sean
Cobra1676@aol.com