'89 745 with '90 5.0 with everything hooked up, manual trans, in Seattle, never had a problem. They sniffed it, it passed, I left with plates. It is illegal for them to look under the hood unless you fail the test. In King County (where Seattle is), if you do fail and they do look under there and they do notice the Ford logos, the car is illegal (only county anywhere in the US where engine swaps are illegal), but in Spokane there is no way they will care. Probably much more primitive test too, easier to pass I'd bet. You should do just fine even without a smog pump as long as your engine is generally in a solid state of tune (good plugs, injectors, compression, etc).