Quite a few local racers have told me to go to Quickdraw over the years. I never had any problems with my ATI converters though. They drove great on the street for an 8", at the track would footbrake to a 1.36(9.90 car), and only slipped about 3% at the stripe.

1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual