BBC 454 Snails and logs. Wot 4050 With newly rebuilt engine and pump. SS AA with Stage 2 and stuffer plate. My Question is, currently I have a 750 cfm Holley vacuum Secondaries. 1)would I benifit from a Manual secondaries and 2) would a larger Carb net me any more RPM. Just wondering as it runs fine now. Currently runs 59 Mph. Not bad I thought for a heavy 22 ft. boat.