New Member in search for advice..

You are going to have fun with those KH disc brakes. That said look under the rear of the car and look at the rearend. If you see no bolts you really luck out (8.75 rear), if not you have either a 7.25 or 8.25. If its the 7.25, just start looking for either the 8.75 or 8.25 rear now.