I would stick with the 268 comp cam you already have. It will have great power and won't be too big for your 360. I think that in this case less is more. You can always change it later!

Go to the Comp Cams website and download Cam Quest. It is a free program in which you enter all of your motor variables and then choose different cams and it will give you a dyno chart so you can see how much HP and TQ each cam will give at what RPM. Is is pretty accurate.

Good luck!

CAC