I have an a500 in my Fury and I'm very happy with it. Required 0 modification to the car, just had to have a new cross member and had to adapt a B&M cable for use with the OEM console shifter. We've had GV in a truck and it just plain didn't make enough difference to be worth it at .78 IMO. FWIW I think I paid around $3200 for mine, and that was drive in drive out with a 383 sitting in front of it. I have a 727 bell welded on and the trans sits exactly where it should in the car so that all kick down and shifter linkage work perfectly and there are no shims to deal with.