And don't rule out the transmission. I was getting a small drip off the bottom of my bell housing. I assumed it was the rear main seal or intake manifold but it turned out to be leaking from the front of the transmission. I had to use
oil dye to find the problem. That dye is good stuff. Well worth the $75 or so for the dye, goggles, special flash light kit. I've used it several times over the years and it works great. It's amazing how you think a leak is coming from one place but after adding the dye, you trace the glow along some seam somewhere and find out that it's coming from somewhere else entirely.
Chris