Advance/retarding stock cam?

IMHO not really unless you want to make sure the valve events are happening when they are supposed too ( the stock motors tend to be all over the place when it comes to this ) but you would need a cam degreeing wheel for this. In the short version advancing the cam makes the power come on sooner (lower peak), retarding the cam makes it come later (higher peak). However it is more involved than that but that is the quick explanation. If you can't go the degreeing route and since this is a stock headed motor I would just put it straight up and down and throw some timing at it via the dizzy.