Ignition box questions

would a Delco branded replacement ECU for a Mopar be wired inside like an HEI or like a stick Mopar ECU?
Its a replacement for the Chrysler part.
HEI is a different system, not just a different control unit. For it to work correctly the entire circuit is converted over.
Does it have enough advantages to make it worth your time and money? If you can keep the proper timing curve, maybe yes.

As far as Delco providing genuine OEM GM quality, sadly, no. The retail parts sold by AC Delco and Delco-Remy no longer are OEM quality replacements.

This was bought in 2019 came in a box with the correct GM part number
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I didn't notice the cockeyed output terminal until on the last leg of a 600 mile trip, the ammeter swung over to discharge. A quick check showed the output wire was loose. But the nut was tight. ****. Fortunately there was just enough daylight to make the remaining 85 miles to my house without using headlights.

Junk!
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and notice the label. Its was done for GM by some other company. Boo.

The original culprit was the insulator.
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Junk!

This is not the type of out-of- spec that that would occur in modern OEM parts. This sort of BS was addressed in the 1980s with the adoption of statistical quality control throughout the supply chain.

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I got lucky, and it didn't short the battery and melt the fusible link.
- rant over -