Another pro-tip for
@aearch. If you stagger your wire cuts you won’t end up with a giant lump when you tape the harness back up.
@aearch,
You will not be able to use any factory ECU with that motor. You have different compression and horsepower. If you need a harness, it would only make sense to start with a factory S38 harness.
With that said, I have a good solution to your computer issue that allows you to keep your special motor. Install Weber 50mm DCOE carbs. 123 distributor. Be done with custom ECU’s and wiring harnesses.
It’s been done before, and it is awesome.