what does the dipstick say?  The car has one right? 
 
 
I was under the impression that it was an oil PRESSURE light, not an oil LEVEL light.  I may be wrong here, but I'd check with real tools before the car leaves your garage again.
FWIW, I think its the same 6 quart capacity as the SOHC.
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				1997 Mustang GT "The Freak"  - 13.80 @ 101.70, 2.07 60' 
1995 Honda VFR750 -  not much @ really fast (actual data pending.)
1964.5 Mustang 289
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