An HEI distributor is definitely the easiest to install and maintain. Points and coil if you want to go original. MSD if you plan on spinning 7500 rpm a lot.
For an HEI all you need is a 12v ignition lead. It get's it's ground through the engine block. Should be a spade type connector in the fuse box labeled IGN. This should have 12v during start and run and is what many use to power an HEI distributor. You can also remove the original wire in the engine wiring harness that went to the coil. It will have a cloth type insulation on it. That is a resistance wire which reduces voltage to the coil to about 9v. Replace it with a standard 12 guage wire to supply the HEI, they need a full 12v.
That's it, unless you want to hook up a tach. The HEI as a connector on it plug in a tach feed.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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