i still use stock studs with my weld 15 x 10 drag lites. 7.5" backspacing. 275/50-15 nitto DRs. no spacers. just alot of grinding to get to clear. i drive everyday on them.
bottom of page shows the grind work on the calipers and wheels mounted on. http://stealthram.com/wheels.htm
what SJM says holds true, to pass tech at the track. the studs must be at least flush with the outer portion of the lug.