For the street? Stick with oil injector. Check your pump often and maks sure the feeder tubes havent backed their way off the nipples below the intake manifold.
For track? rip it off and go pre-mix. One less mechanical thing to **** up on you, as well as a slight weight savings. Oh and you can have a better selection of oils to use since the good ones shouldn't be used for injector systems.
As for jetting and stuff when using pre-mix, check out the other thread going at this very moment titled "PRE-MIX".
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Charles Gallant