[custom1970]

Yes, the first thing we're going to do is re-check the starter, if it ever stops raining!! If that's the problem it's an easy fix.
What we're afraid of is that there's some safety device that's preventing the switch from sending power to the starter. There several old connectors for the '89 harness/engine that no longer have a home... and are not plugged into anything.
And the grounds were a good call, but the old straps were cleaned and hooked up.

Thanks,