Ok, probably been asked before, but couldn't find it down below. My bro has a 77 Jimmy and the old Q-Jet is on it's last legs. Was looking at an Edelbrok Performer Q-Jet as a repacement. Do these work as well as the original Q-Jets in off-road situations (angles, etc.)? Is it still possible to get the original (Delco?) Quadrajets new? Also, I've got a Carter style Edelbrock carb with a Performer manifold that came off another truck. Are these any good for off-road use? Appreciate the advice!