Agreed 100 percent with JLMounce. Switching over in my 1976 from carb to EFI was well worth the effort for me, but as mentioned, Gremlins demanded patience. For me it was mostly grounds and wiring-MSD box-coil positioning, attention to detail, and proper wire connecting. To clean the current I also ran it through a MSD75643 Solid State Relay. Just took time and process of elimination. But grounds were key. Even good looking old grounds need to be pulled off and cleaned. For timing control, I already had a Pro-Billet dizzy so all I hade to do was swap to an adjustable rotor for phasing (MSD84211). Fact is, installing it was relatively quick, working through the gremlins on an old car took the time. But, others have no hassles. On your HP question, I have about 575 or thereabouts.
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