Just a couple drops is normal as far as I'm concerned.
I would't do anything but keep an eye on it. If sometime down the road the engine does need to come out, then the leaks can be addressed. I would not go in for such a minor leak.
Have you checked the transmission oil level and condition? Those are notorious for collecting water, which raises the level. Over filled it will surely leak out the front and into the brakes.
Same with the engine, too much oil and it will leak. A lot of the old rope seal engines actually do better running a little below full.
If you do change the transmission/differential oil, best fill it through one of the inspection covers. Filling it through the transmission fill plug hole can cause oil to leak into the clutch. The passages from the transmission to the rear housings are small, pour oil in too fast and it comes out the front seal.