DU,
Do you have a blowproof bellhousing?
If so Drill a drain hole in the bottom of it to keep any
oil from puddling in it.
1/4 or 3/8" is fine. The problem with
oil is it has a mind of its own and will follow the path along seams and ridges.
I am a plumber and can tell you some stories about a leak showing up 30' or more from the source.
If you have a leak coming from your bellhousing it is probably not your engine and is more likely your trans.
Taste the fluid. Gear fluid taste like it smells, BAD.
Oil is not bad. Brake fluid taste like it is melting your tongue out of your head. Ask me how I know.
Does it happen only after you drive for some distance?
Can you start the car up, move it out of the garage, let it warm up and run for a few , pull it back in the garage and still have a puddle of oil under the car?
If it still leaks then it could be the oil galley plugs but if it does not I would look at the intake and valvecovers.
Did I mention I hate oil leaking out of my car?