I just obtained a pair of 15x8.5 slotted mags for my 69 x-r7 and I got some tires for dirt cheep for them. So when I put them on they were too big by half an inch so the stainles trim rubs on the tire. I was thinking of lifting the rear of the car 3 to 4 inches for clearance. I would like some input on how to do so and what would be a good height without overdoing it. Is there a kit I could get to do this?