273 build, tips?

Im building up the 273 in my 67 dart and would just like to know if Im heading in the right direction. Before anyone mentions, yes I know a 318 is cheaper and probably better, but my father and I built this car 5 years ago when I was 15 and we just decided it needed a little somthing more. Plus my older brother has a 318 in his 72 dart and I want mine to be as different as possible from his lol. So Ive started gathering parts for the build up and would just like some tips on if I ve made good choices or just some general advice. I'm planning on boring it over .30, I have bought a 750cfm holly for it (I couldnt pass it up It was $20 on ebay shipping and all so if it doesnt work I havent really lost anything), my father and I figured we'd keep the stock heads but mill them just so we wouldnt have to notch the cylinders for larger valves, and put in a larger cam(I literally know nothing about cams, so some tips or suggestions here would be much appreciated), I plan on adding a set of good headers(not sure what brand yet) into purple hornies mufflers and out the back with a new exaust(one in it is original, still sounds good though) and the older man we bought it off of had a 9inch ford rear end in it when we bought it so I was thinking maybe 3.73 gears unless someone suggested otherwise. Suggestions?