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Depending on the engine application, #3 might be the best way to go.
If the engine has the injector fitting holes, like an SE engine, I would plumb into those. Otherwise, install the stock oil injector fittings into the runners of the intake.
I don't like the idea of plumbing the OMP lines into the float bowls. While it resembles premixing, without the hassle of premixing, the extra oil would be slower getting into the engine. It would have to mix with the fuel before introduced into the engine.
Using the stock oil injectors would eliminate this delayed oil addition, and supply the added oil as needed.
I don't have the OMP on my SE engine fitted with the edelbrock. It was already removed when I got the car, so I have little choice but premix. I spose I could find an OMP and the oil injectors, then rig up an OMP rod. But, premixing is far simpler for now. FWIW, the car also came with a partial gallon jug of MMO, so I know it has been on premix for quite some time.
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