1 - Belt length it depends how your alternator is attached. Suggest you mount the alternator, cut an an old A- or 4L-section (1/2" wide) belt, wrap it around both pulleys, mark where the belt overlaps, then measure the actual length required.
2 - For a Delco on an H I recommend a solid mount. Arrange it so the alternator is JUST (1/8") clear of the rockerbox - otherwise the hood won't fit over. Then use an adjustable idler to set the belt tension.
3 - The old stock ammeter will work fine. It'll peg on the charge side after your first start the engine but it won't harm the ammeter. (My Super M's been pegging its original ammeter for 35+ years - it still works perfectly!)
4 - A coil marked "w/o series resistance" requires no ballast resistor. You should be wired direct to the ignition switch.
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Tip: Use the SMALLEST pulley possible on the alternator! Otherwise the 1-wire alternator may not spin up fast enough to cause the regulator to "turn on" at startup.
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Today's Featured Article - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil’s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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