I've got the ASP solid mounts (87-93) and really like them. They don't seem to be much more than a block of aluminum with some high-strength studs in them, but they're definitely rigid and that's the idea. I think they were about $55 from FordSpeed. With the ASP mounts, you have to reuse part of the mount from your stock (pre-93) motor mounts so if you don't have the two-piece mounts for your car you'll have to scrounge some up.
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Jeff Chambers
Trophy Stock #3
11.86 Seconds / 113.8 MPH
Chambers Racing Team