What's the state of the entire fuel system? On the SOHC cars just as a rule of thumb we now just replace the fuel pump, have the injectors cleaned and rebuilt, replace the fuel pressure gauge and change the fuel filter. If you don't know, I would just replace them all. Because at some point you're going to be chasing that problem for a while. You'll have a complete failure in one, replace it and get that fixed and next thing you know you're chasing the next weak link because it fails. You'll save yourself a lot of time and hassle to just replace the whole fuel system at once. That way you can rule out the fuel system as part of the problem for the lean/rich condition and start looking at spark, ecu, etc. We learned that the hard way. Then make sure the ignition system is up to par. We've had a lot of problems with distributors on those cars because of it's proximity to the header. If your header isn't wrapped or have some thermal coating you will cook the distributor and it usually happens on track leading to wacky timing and results in a blown motor. Replace spark plugs, wires, cap and rotor if you don't know the condition of those either. I hate throwing money at problems, but if all of those things are suspect as far as age/condition they will fail and it will just cause headaches. You need to be on top of maintenance with these cars or bad things will happen. They're not as bullet proof as say the hondas or mazdas, at least IMHO and experience with them.

Good luck.

Edit: Here's a good post of all things to go thru.
http://itforum.improvedtouring.com/forums/...indpost&p=64511

steve