I've used the 'bonded rubber' mounts on the 84 4KQ RR car. This car has been subjected to many *very hard* launches for both auto-x and 1/4 mile action in the past with no MM problems a-tall. I would use them again here. I did however opt for the far more expen$ive original-type 'hydraulic' mounts for the 85 ur-q KUQEFH upgrade. -glen