Before you go to the considerable trouble of changing the cam, let's ask the other folks here about your carb, it might be too large for low rpm torque? A new carb is not cheap but it is a lot easier to bolt on a smaller carb (600 cfm) than to change a cam. Sometimes you have to try swapping expensive parts to get the right set up, but other folks here should be able to advise you before you start buying new parts. It is just my limited opinion, but I would guess you would get better low rpm performance with a smaller carb.

Don Shillady
Retired Scientist/teen rodder