Swayde, IF this is what you want to do;
" I'm curious now if the the engine from the 89 would be compatible with the 90? That would save a heap of trouble with salvage yards."
The answer is yes. BY swapping the intake manifold and distributor and using the fuel pump block off plate from the '90.
In other words, '89 remove the intake, distributor and fuel pump. '90 remove intake manifold, distributor and the block off plate where the mechanical fuel pump would go on the '89.
Install the '90 intake manifold, distributor, and the block off plate onto the '89 engine. Done. You will have changed the '89 engine into a '90 engine.
I don't understand the big confusion on the issue, but then again maybe I haven't explained it clearly.
That was actually a huge help, I hadn't quite got the picture yet but it makes sense now.
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