now that my 68 is on the road ive found that after it warms up to normal temp the oil pressure gauge drops to some rather low levels after its been running a bit. when i fire it up in the morning it will get to about 50PSI but then fall to as low as 5psi when idling while its hot. there is 20W50 oil in the car now, ive changed the oil several times since i got it fired ( damn leaking drain plug ) and now its leak free and this is probably the only thing that bothers me about how this car is running and driving at the moment. ( no, not even the rust or the moss bothers me lol ) its a 390 2v by the way. any ideas? new oil pump time? just a tired engine? the engine doesnt seem to knock or overheat. it runs at about 170 degrees even though i just mildly ran the hose through the block to clean it out. thougts? suggestions? ridicule?