If you're going solid mounts, don't forget the tranny mount has to be solid too. Rather then solid mounts, you might want to consider a front and mid motor plate. Like the other guys said, they will shake the heck out of you and everything else on the car. If you go with plates, don't forget to use a travel limiter for fore and aft engine movement, it will lessen the breakage problem with extended use on the street or track.