AS suggested above, if you have a timing pin on the front of the engine, you may find it easier to see the mark there. You'd need to paint on a new mark on the pulley. Bouncing ball means erratic engine. Could be ignition related - how old are the plug wires? I had a bad set that took me a while to track down. There is a school of thought that supports setting max advance, which if memory serves, means getting full advance (33 deg or so) by 3000 rpm.