Not the same ignition or vehicle, but I had a friend make a mounting plate for my '52 GMC six distributor. I put a mid-70's Chrysler slant six pickup and reluctor wheel in the distributor and hid a GM HEI module and a heat sink inside a gutted voltage regulator box on the firewall. The HEI module runs a MSD 8202 Blaster 2 coil. To connect the mag pickup to the HEI I used about 6 feet of shielded #22 twisted pair wire I found on eBay. It has been working well since installation 6+ years and 30,000+ miles ago.
My initial testing used 10 feet of that twisted pair wire, just to present a "worst case" environment.
Don't forget to ground just one end of the shield. I chose the HEI end because the connection was much easier to make.
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic.
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