I've had more bad race converters than good ones, I ended up finding out that a very good 8 inch race converter from Turbo Action was the best converter I have owned. It was made for a SS/AH back in the late 1990s, that was a GREAT street and strip converter. It would drive away very nicely from a dead stop with very light throttle pressure and set me way back in the seat when foot stalling it up around 3600 RPM before flooring it at the races
Paul Rossi use to test converters for Turbo Action and he made a comment one night when testing at O.C.I.R years ago, he said you are truly blest when you get a really good converter That was back in the late 1970s