Oil in the SC won't hurt anything; if anything it'll help it seal better, and there shouldn't be enough quantity there to make a difference anyway (not when compared to the quantity of fuel that'll be there). What you want is a way to put it into a non-pressurized place in the intake. I would recommend connecting them at the top of the carb (pre-throttle plates).
On a Weber setup on a first gen I ran the OMP lines through a pair of holes in the bottom of the filter box, looped around inside the box, and pointed face down into the middle of each carb barrel, held by a little metal bracket. It worked fine for an entire year or so, then I swapped to EFI and sold the webers.
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