M&H is a great wiring company, but, make absolutely sure you get EVERYTHING correct in the request. If you make a wire dimension that is too short, that IS the way they make it, no questions.
When I di a 12SI alternator, I do a simple 3 wire stocker 94 ampere Chevy Citation unit into an external single wire. 14 gauge wire from BATT to side terminal 2, done, finished, works as EVERY other external or internal jumped 12SI. From there, the large existing BATTERY cable from the old alternator, goes to the BATT terminal on the rear of the altrnator, just like the original one.
As far as powering up the HEI with a stock wiring system, look at the fuse box, fnd the IGN terminal, and check it for power in both start and run. If good, single 12 gauge wire to the BATT terminal on the distributor cap, done.
M&H will do it differently, both work same.
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