I installed my 90 gt HO engine in my father-in-laws 87 ford country squire wagon which had a non-ho 302 in it. We kept the non-ho computer in it. However, the two engines have completely different firing orders. You have to rewire both the spark plug wires and the fuel injectors at the engine harness. The car runs good this way, but the gas mileage is not what it should be. We are going to swap in a HO computer to see if that fixes things.
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