budget 273 build

The whole reason I bought the car was to get good at power shifting a 4 speed and because the car is slick looking. I have cut a couple good shifts, I am just not good enough at it to appreciate a higher horsepower engine. I believe the 4 barrel version in my GT had the high compression piston(10.5to1) and CP sells forged pistons to that spec for a 273. Cam lift for my GT stock is .425 inch lift and 248 degrees advertised duration for intake and exhaust. The only thing I plan on doing to the heads is gaskets matching and a three angle valve job while also retaining stock valve size. I realize shaving some metal off around the throat and bowl will definitely improve flow but I'm not going to get that crazy this go around. I also would like to put an aluminum single plane on it(edelbrock torker)for the weight loss and because it does not have the bends like the stock cast iron. I don't think the runner size is too big for this engine, it shouldn't hurt low end performance to bad. I was also definitely thinking about swapping the old AFB for a holley no bigger than 700 to 750cfm. I like the the idea of dougs headers with 1-5/8 inch primaries but for this build I think the tubes are a little big so I think I stick with the manifolds. Any ideas on what cam I should use for this combo. I don't know if a .500 plus lift cam would be worth it without massaging the ports. I don't mind a rough idle so a longer duration an tighter lobe separation wouldn't bother me especially if it pulls like a freight train on the upper rpms