The front plate mid plate set-up was way easier than regular motor mounts. I originally used stock mounts, but switched to the motor plates when I decided to make it purely a track car.
The front plate is 1/4" aluminum and sandwiches between the water pump and timing cover. The rear plate is .090" steel and sandwiches between the block and bell housing. The front plate on mine attached to tabs welded to tubes at the front strut towers. The mid plate is attached to two tabs welded to the frame. I use a regular rubber transmission mount.
You can buy front and mid plates for the SBF that have the water pump and bell housing bolt patterns already machined. The plates come with a lot of extra material that allow you to trim to fit about anything.