Oil gets onto the spark plug because there was a bad spark plug tube seal design on the d15b2. They almost all do that after enough miles, but does not effect performance. Mine put out a healthy 79 WHP stock on a mustang dyno with oil all over some of the plugs.
Clutch is cable, you can get a new one from Honda for under $40, or just try adjusting the one on there now.
If you've got a bad wobble and the car hit a curb, the upper a-arm may have bent or the ball joint is failing. This happened to me. I'd go ahead and replace those anyways, along with pretty much all the rubber bushings in the car.
Check your wheel bearings for play and make sure the calipers aren't sticking to a possibly warped rotor. Lastly, check the axles, and depending on how they look I might just replace those too(good excuse to flush the transmission, it would probably appreciate it). One of those things is probably the cause, unless the wheel/tire is just out of balance.
I paid $300 for my first EF, it was also getting ready to head to the scrapper. I have gotten it to be both reliable and fun over several years and 80,000 miles of maintenance and upgrades. Super simple to work on and a huge aftermarket. You'll love the little car.