Slant 6 HEI Distributor

JoeSBP said

you just need a factory electronic distributor and a 4-pin HEI module. It doesn't get much easier. I used one of their distributors for an AMC 304 and they are nice, but there are much cheaper options..
Slant Six Forum, :: View topic - HEI Electronic Ignition Retrofit How-To

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That's right.
If you already have an electronic distributor it costs about 100 bucks or less to make it true HEI. (module, coil, terminals and wire)
If you don't already have electronic add about 70 bucks for one of those distributors and your set.