The front bushing on the spring does not affect ride quality that much. Several people have told me that you can switch to a poly or aluminum front bushing to get better performance and keep the rear rubber bushings to get a good ride.
I also understand that Competition Engineering makes the best traction bars for 67-69 Camaros. Most companies make them for 67-81 and these are too short. I bought C.E. traction bars and have been happy with them. However, even with the appropriate street air gap (I use 1.5 inches), on large bumps the snubber will hit the spring and make a big BANG, like the sound when you bottom out the suspension.
I have also heard that they can negatively impact handling, but I think the proper air gap can solve this problem.
Hugger Orange & white 69 Camaro with supercharged 350, Tremec TKO, and 3.73 12-bolt