Oil pressure line, no sender. The other port has a gauge screwed into it, so I can watch the pressure while under the hood.
Definitely dry in that area.

Cab, thanks for the tip about using flour! Everything's pretty clean, it's a new engine with only cam break-in time (and a whole 0.3 miles on the Autometer speedo)
I should be able to run my fingers behind the heads after running for a few minutes, and make sure it's dry, too.

If I do have to get to the rear main seal, I may not put the girdle back on (with my ported iron heads I won't be making over 500 hp anyway, at least without nitrous). When I have my bare aluminum heads worked by Dwayne, then I'll be near 600 hp and I can go through the trouble of re-shimming the girdle from underneath.

My other half is going to love it when I fire the beast up in the garage