Check with some of the supercharger vendors, I think Vortec has some sort of punch thru setup they use to allow the oil to drain from the supercharger, installs without removing the pan or drilling.
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Brad
1997 Eclipse Spyder GST 14.1 @ 100 MPH
1991 Eagle Talon AWD (HOW) 11.574 @ 115.29 MPH
1990 Plymouth Laser RS-T (Organ Donor) 13.19 @ 110 MPH