I was having real issues trying to decide what tire and wheel combo to go on my 40 when I changed all my suspension around. The only thing I can really say to you is, try this. Get some plywood and cut a 24" or 26" circle. Drill a hole in the center and then drill your bolt pattern in the wood. Make 2 for the front and 2 for the rear at 29" or bigger diameter. You can bolt these on your car then using jacks lower the car down and settle the suspension enough to get an idea of what the car can look like. It can be a bit of a job to do this, but then at least you have an idea before you take it apart. Mine is a guessing game until I put the body back on. I've seen guys use card board to do this too. Either way, just be careful setting the car back down with the wheels off. You could even just put 4 short jack stands under it if you have short enough ones.