If you mounted the bottom of the pumpkin with a couple of angles along each side they won't be any lower than the bottom of the diff. This setup doesn't need the Jag lower control arms or brakes they are already on the car. That reminds me, you could also connect to the bolts that normally hold the caliper. That is the bolt holes that can handle the stopping force of a big heavy Jag. Remember braking is more severe than acceleration. Those are also the bolt holes that mount the side plates that hang the diff in a real 427 Cobra rear end with a little bracket to hold the front from twisting. The stock rear may also surprise you. I had a Salisbury 4 cyl rear axle with a hot 302W in front of it that I couldn't break or afford the tires trying to. It's no egg, it's a cast ribbed 105 pound lump of steel. If you can break the case in this application I'll give you another one
