Quadrajets actually work great on a small block mopar thermal quad intake. I bought a 67 Barracuda back in 82 with a 318, 360 j heads with a double roller chain,3 speed manual and not sure what else was done to the engine. I bought it from a machinist. We romped on it on the way home and when the secondaries popped it was exhilarating. Under further examination when we got home there was a Quadrajet on it. It ran so good with that quadrajet I left it on for the whole time I drove the car.