You can easily pre-oil your motor with a pre-oil tool and a good HD reversible drill. The procedure is to remove the distributor and the oil pump drive. Insert the pre-oil shaft down into the motor and engage it into your oil pump. Connect your drill to the shaft and run your drill in reverse (run the drill forward for a small block) to pre-oil the motor. As a warning, make sure that you have either a guage or a block-off hooked up at the rear of the block (1/4" pipe threads where you normally connect the oil pressure sending unit) or when you pre-oil the motor, oil will shoot out of that hole all over.
Here is a link to the pre-oil tool:
http://chucker54.stores.yahoo.net/oilpumprimto.html