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Timing timing timing. Set it at 12 to start and you'll notice an immediate difference. Which HEI do you have, stock or aftermarket? It needs to be curved as well to set the timing correctly so you can set your total timing to 36 degrees. The carb needs fuel pressure restricted to 5.5 psi and the floats need to be adjusted to Edelbrock specs to stop flooding. A heat insulating gasket needs to be used as well (Edelbrock 9266) to stop fuel percolation. You're also gonna need a calibration kit to change rods, jets, and step-up springs. Let us know about your HEI and we can help you get it curved right. Need to know how many degrees of mechanical and vacuum advance it provides.