if you get aftermarket cams you should get adjustable cam gears...just get good ones that have plenty of bolts. like was stated before there is extra power and improved powerband by degreeing in the cams and this is usually done w/ the adjustable cam gears.

if you have extremely high compression and or oversized valves and are not sure of the clearances then keeping them at 0,0 would be suggested. however, if you want to get the real benefits of aftermarket cams then get adjustable gears and have them degreed in.

example of why is on a lot of vtec cars w/ aftermarket cams the vtec point has to be so high w/ the cams at 0,0 or else the car loses power w/ a lower vtec crossover. by degreeing them in you are able to bring vtec in lower and not have a power loss and make more power throughout the powerband.

the real question is...do you really need aftermarket cams?