I ran into this article about fuel injecting a slant 6 Mopar and I thought it might be useful for stovebolting: efi for slant
It uses a GM 3.8L batch fired EFI setup and uses GM parts for the most part. It looks like it would work great on a 235 or 261. I don't think the siamese ports will be a problem if you set the injectors up right.

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