Re: Help clarify harness adaptation existing HEI to OE points
I had similar results when I switched the Pro Billet MSD distributor out for a correct distributor for my 1972 Cheyenne 402. The truck has a lot more pep and idled smoother.
The few downsides to points are the occasional rubbing block and contact wear. For as little as mine are driven, it will be years before they need a tune up. Using USA made old issue parts does make a difference, and also using the proper distributor cam lube.
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1970 K/5 Blazer CST 4WD, Bronze, 93k ACT. miles, 350, 4 speed, positraction, 16.5" x 8.25" wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration in progress... 
1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 
2017 Sierra 1500 SLT 4WD, Black, 41k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2...
2019 Canyon SLT 4WD, White, 60k miles, 3.6, 8L45, 3.23 LS, 18" wheels
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