Do you have the Pro-street model with the sight glass on the front? If so, the oil should be at the bottom of the sight glass. It fills from a plug on the top of the unit. The rear bearings are sealed and do not require any maintenance.

Check this link - http://holley.com/data/Products/Tech...99R10244-1.pdf

It is a pdf with all the good info you'll need..

Good Luck,
Glenn