Watching with interest, as I seem to have the same problems. I have 80 model, 383 engine, 12 bolt. Just finished replacing rear bushings (Hotchkiss lowers, Edelbrock adjustable uppers). Video shows major change in front geometry when launching, other local Bu owners say add bump steer kit. Car wants to get very evil when letting off gas, trying to tighten up all suspension. Bu is new to me, last car was backhalved Nova w/ladder bar, this is all different so going through learning process. Also, can anyone tell me if there is difference on front control arms (mine are still stock) that would cause the wheelbase to show shorter on left side (about 1/2") - I can find nothing else that would explain this, but have been told that upper left front control arm is different dimension than the right. (????) I looked at the frame dimension sheets elsewhere on this site, and it appears that the upper arms sit differently from side to side. BTW, this car is mostly a dragger, but sees some street use. Any thoughts or advice appreciated, and will continue to follow things here. Thanks in advance.... Rick