How do you plan to drive the car? Just a nice Sunday cruiser, or will you be taking this down the track? If you are just using the car for nice Sunday drives, and want to keep it simple, stick with one carb and don't go too big with the cam. I don't have power brakes, so my big cam doesn't hurt me, but I assume you do have power brakes? Also, if you go more than 10:1 compression, you won't be able to use pump gas without pinging.