How can this be? The 1985 Pontiac 305 in my roadster pickup runs great, (I just put a rebuilt quadrajet on it). I put new timing chain and sprockets on it when I took it out of the donor car. I had the distributor out of the engine while the engine was being cleaned and painted. Now everything is reassembled, and it runs great----starts good, idles great, and has a nice crisp throttle response. The thing thats driving me crazy, is that with my timing light on number one plug, I can not see the damn timing mark. I can't even rotate the distributor enough to make the timing mark come close to the timing pointer side of the motor. If I had installed the timing chain or sprockets incorrectly, I'm sure the engine wouldn't run at all, or certainly not as well as it does. The engine was running good when I removed it from the donor car, however I never put a timing light on the engine before I took it out of the car, so I'm not sure that the timing mark was in the correct place even then. I have heard that timing marks on harmonic balancers can slip because of the rubber dampening material in the dampener, but could they slip 180 degrees, or far enough that they wouldn't even be on the correct side? This is making me nutso.