i run Ken's bar. it works well. the installation is an obvious breeze as there is no welding required. i found that you have to make sure the spot welds holding the diff tubes in have to be ground smooth. i find that the higher the wheel stand, the quicker my run. As sson as i run the bar i lose .1. i set it so it just misses the rear valance (i know cause i have the dents to prove it!), for every inch i lower it i lose .06 to .1. i have run as quick as 1.33 60 ft and i am not having any spin or unloading issues through the launch.
last time i checked, he had some good photos on his site.
http://kenkeirracecars.com/
Ian
1968 Camaro
F/CM