I've genereally found if the port cross section is relatively small compared the the cylinder swept volume (as is usually the case with a lot of wedge strokers), putting the cam in later helps the top end power, also an under-ported motor (if it has any decent compression) generally has an abundance of torque to begin with.

Advancing the cam generally works well when you've got plenty of port, adequate cam and compression but you're wanting to "use it all up" within a certain RPM limit.