I'm running a f-303 cam with my 306 @ .512 lift. Not as radical as the x-303. But it gives it a nice semi-rough idle that i like. 
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90 LX 5.0 ,bored 302, MSD 6AL, Twisted Wedge TrickFlo HDs, World class T5, BBK fender cold air induct., 70mm TB,Edelbrock performer Intake, aluminum Drve shaft, 3.55 Gears, Long Tube Headers to Flowmasters.
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