My parts car is driveable, and has an 86 305 HO with the 700R4. I drive it once in a while since I can't drive the 83 currently, and when I do, I normally drive in each gear until I want it to shift, like a manual. I normally shift between 2500 and 3000 rpm under normal accleration. I noticed that the oil (Quaker State 10w30 Full Synthetic) has gone black as tar, and it is using about a quart every 500 miles or so. In your opinions, do you think that the consumption is due to valve seals or rings? It is too hard to diagnose the engine for a miss as it has a computer controlled Q Jet with no computer or wiring (was originally a TPI car). It does idle very smooth, though, all considering and pulls a rock solid vacum of 17.5 . Thanks in advance!