My Dad was the Holley guy . Man he would spend hours working and tricking out Holleys . He ran the jet tubes and the pump shooters with tne longer nozzles . Also the larger 50cc accelerator pumps and # 98 to100 jets . The carb he like was the 850DP with the 4-corner idle screws . And a 2" 4 hole spacer . He ran it on a Pontiac 455 30 over mostly strip car .