Wayne, KobraKarl may be onto it...don't know if the Dove block has the side-oiler gallery with the machine plug at the front (near the
oil filter pad), but that plug is a bear to seal. It sees engine pressure, and if it isn't sealed, it will insure that you'll never have rust on the bottom of the car, from all the
oil it pumps out at speed, then leave virtually no puddles (under the motor, anyway) when you park it. Pressure leak sounds VERY likely. Let us know what you find.