Are you using a mechanical fuel pump? If so check the lower pump housing to the oil galley plug under the fuel pump boss to see the pump is touching it or not scope If it is touching it you may have found your oil leak up
if your not using a mechanical fuel pump check the block off plate for the same thing, Murphy loves messing with us hot rodders and drag racers whistling rant

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)