Usually the size of the engine, compression, and weight of the car comes into play. If it's a heavy car and small engine most cam manufacturers recommend advancing it. EX: my car is 3200 lbs with a 377" it has a cam ground on 106 lobe ctr's. I install it at 102 for the torque needed. In fact i install almost every sm/blk racing cam at 102 unless it's a street engine with low compression. I have pretty good connections with Bullit and Comp cam, so i usually call and tell them what i have what do they recommend, with the enginge size,car weight,converter, gear and tire size.
JMO
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