It's going to depend a lot on your cam as to whether you will benefit or not.
The most important is that you have an early model (pre-'72) timing set or not. '72 is when they retarded the timing 7* for smog control. That is the bigest improvement you can make.
Have you run your engine on Desk top Dyno? If not, that is a great way to see what advancing your cam will do.
Ken F