Vik,
The Super Ride is based on the MII geometry with the exception of the rack location and commensurate effect on steering arm design. It was Heidt's product to appeal to the need for rear steer IFS for '28-32 Fords.

Jim Meyer has a good reputation for quality and function.

One thought on your brake rotor size issue. The 12's may work with the 16's but I would only do that if I were ABSOLUTELY positive I was NEVER going to change wheel size down.....EVER!