[quote=Cab_Burge]You would be wise to check with your local division tech guy about what they currently rate the 1971 340 motors in the A bodies compared to what they rate the 1970 340 with the AVS in NHRA stock, same deal on the 1972 and 1973 340 thermoquad motors
I use to race in NHRA stock, a good friend of mine set E/SA record in his 1971 340 Demon at 10.89 that stood for two years before NHRA put it back to a minimum
NHRA can be very political, all the Chevy racers in his class griped and cried and file protest on him until NHRA refactor his combination up to 305 HP
He built a new car, 1970 Challenger T/A clone and set the record in it also, they ended up refactoring that combination to 315 HP in the T/A Challengers, the 340 6 pack AAR didn't get hit at all
He finally quit NHRA racing and got into Jeeps and off roading [/knuote

The Demon was my old car. First Stick 340 to hold record in the 11"s Gene bought it from Xavier Conklin many years later. he and Etter were in a race to the 10"s Gene won. The Ta Challenger was super quick. I saw it go 10.40's. It was legal in the day but would not pass tech now. It was factored to 320 hp after a really quick run at Pomona.

The original question was is the Tquad worth the HP factor. Chuck Beach could build you really quick AVS. Jerry Bennet runs really quick with an AVS in his Duster. I still feel the Tquad is a better combo especially if you can get your hands on a 4972 or 4973.

If you run an Ebody then the best Combo is 340 six pack. rated 304 with aluminum heads with both stick and auto or the stick combo rated 308 with iron heads.