Hello all. I am considering buying a 1995 540i M-Sport that may be in need of a new head gasket. I was wondering how many hours I should expect to be billed for at a shop. Anyone know the AllData time? What would I be looking at in parts cost alone? Thanks.

2000 BMW 540i 6-Speed
-Japan Red/Sand Leather
-Dinan Stage 3 Engine Software
-Dinan High Flow Throttle Body
-Dinan Cold Air Intake
-Bilstein Sport Struts and Shocks
-H&R Sport Springs
-M5 Rear Sway Bar
-Rogue Engineering Octane SSK
-Rogue Engineering Transmission Mounts
-Bavarian Autosport Clutch Unlock Valve
-Center Resonator Delete
-16:9 Navigation Screen
-MKIV DVD Navigation Unit
-Infinity Perfect 12" Subwoofer w/ Custom Molded Fiberglass Enclosure
-M5 Rear Decklid Spoiler
-Factory Euro Clear Markers All Around
-European Front License Plate w/ Factory Front Plate Mount