The real Carter AFB's are fine not the later E-clone that gave it a bad name.
I build AFB's along with every other brand for people and the AFB's are quite simple...easy !.
Looks like I have another test mule to wideband on & tune carbs on.
So now my brother claims that our parents 67' GP vert went better than his 70' GTO....and this is back in the day when these cars were new.
All I know is the 670 head is closed chamber and you may gain a few cc's over the 12's or 13's in the 70' Goat...he made no mention of his 65' GTO...
I did read an article somewhere the qjet in 67' made more power but was down 10 ft lbs in tq.