The creator of the Street Demon carburetor worked for Carter back in the hey day of our musclecars. He took the best attributes of the Carter AFB, The Rochester Quadrajet and most obvious- the beloved Carter Thermoquad and created a modern carburetor. I have no doubt remanufactured Thermoquads from the correct rebuilder work great. But for NOT alot of $$ one can have a brand new carb with available obtainable parts.