You can buy offset crank woodrift keys to advance or retard your camshaft.
Or they sell a set (cam, crankshaft gears) that the crankshaft gear has three different degrees on them,, advance,straight-up or retard, you do not pull off your cam gear, just the crank gear.
The reason you degree a camshaft is to make sure the timing events are where they are supposed to be in according to your cam card.
It is possible the cam is ground retarded or advanced or correct.
It also verifys the crank & cam gears are machined correctly.
MBHD
