Well if it's not the disty on a 16v then the only other oil leak locations I can think of back there would be the valve cover gasket, the head gasket, or the rear main.
As far as your 8v mhn3773, definitely try to establish where the leak's coming from, work your way down from the o-rings in the distributor to the valve cover gasket, possibly the rubber plugs on the 4 bolts that hold the valve cover on, then the head gasket then if it's not till you're lower on the engine than the head it's got to be either your rear main or pan gasket.
Valve cover's easy enough,
Head gasket sucks to do on any vehicle but it's probably the least likely culprit anyway.
Most likely suspect is definitely the rear main. Gotta pull the tranny of course to do that. The rear main is in a separate piece that is bolted to the back of the block and has a couple side gaskets if memory serves me. Once you have the tranny out and the flywheel or driveplate off then you have to take off the oil pan. Finally take off the bolts around the rear main housing piece.
Clean the old gasket crap off there carefully and clean up the mating surfaces with brake cleaner and then put it back together with some good RTV or another good gasket dressing material like hylomar in just a thin film. The gasket pieces that mount the flange holding the "ring" seal will stick out below the deck that the oil pan mates to. You need to cut them off flush with a razor blade.
While you're in there you might as well check the torque on the main cap bolts. It's possible your rear main is leaking because of wear on the bearings causing the crank to move around more than it should. If you replace the rear main and it stays sealed right away but then starts leaking in a few months that's a good sign your main bearings might be worn more than they should be. (Same situation applies with rear axle seals if your axle bearings are wearing too much).
Chances are your oil pan is using RTV for it's gasket. You'll want to get the old stuff off as much as possible. There's stuff to disolve it you can get at some auto parts stores. It's not magic but it does help get the old crap off there a little bit better than just scraping. Make sure you clean it off good and then clean the whole pan with brake cleaner to get a nice clean sealing surface.
Since the oil pan bolts are spec'd to 8 lb feet of torque, do yourself a favor and get an inch pound torque wrench. To convert lb feet to inch pounds multiply the lb feet by 12. The reason you want the inch pound wrench is that most torque wrenches are horribly inaccurate at the high and low end of the range they use, 8 lb feet is way at the bottom on lb feet torque wrenches but 96 inch lbs is in the middle of the range enough you can get an accurate reading. If you don't get your oil pan bolts on just right it's a leak waiting to happen. Thankfully the RTV is a bit more forgiving than actual oil pan gaskets are. You also want to make sure the steel pan's mating flange is in good shape and not dimpled since that tends to cause leaks too.
It's not fun but like I said there are nastier rear main designs out there too.
If you're planning to do work on your rig yourself, do yourself a huge favor and pay the 90 bucks or so for a factory manual, it's so much better than either the Haynes or the Chilton books. (Especially for tracking down EFI and other electriclal problems). It also spells stuff out in more detail and you know it's specific to your rig instead of general info that covers a bunch of model years in less detail. The other nice thing is that there are usually addendums printed to factory manuals if there is an error, with Haynes and Chiltons you just have to hope they updated their book correctly and since they typically just borrow the highlights from factory books you never know.
Anyway, hope that helps ya out. Just cross your fingers and hope it's the valve cover gasket or the o-rings or the plugs on the valve cover bolts.