Major upgrades! Any ideas on hp gains?

I agree w/ moper, that intake will be the next restriction to be removed. You need to consider the whole package for any changes to be effective. Unfortunately, (or, fortunately, depending on POV ) it could be the beginning of a long list of mods to come. After changing the cam & intake , the carb may be next , then to take advantage of those changes, tourqe conv. & gears ,and so on.... Then you'll find that you want to go faster, and a 360 will sound like a good ideal....