I've got a 69 351W-4V. that is spitting wet black soot out of the tail pipes, particularily when first starting. I think this is the carb running too rich. Anyway I've decided to go ahead and change the manifold and card to a new set up. The car is basically stock with a mild cam in it. What is a good set up for general street use with a bit more power without altering the hood etc? I do have headman headers and dual exhaust.