slant daily driver buildup

I will probably just pull the 225 out of the 73 duster and use that trans as well, I will lose the push button but that is fine with me. I have heard about putting a 2 barrel intake on the motor will give me better mileage. If I did that I would probably buy a new holley two barrel or a demon two barrel. The demon comes with an electric choke and is not much more expensive than the holley. I am thinking about the master rebuild kit from northern auto parts, has anyone used this? I probably wont do any head work other than a 3 angle valve grind, depends on the condition of the head. What cam would work best for a daily driver? I am looking to give the motor some more power for the pulls up the mountain but would still like to achive the best mpg I can. Do you recommend headers and if so what kind, also what should i do for exhaust? I wouldnt mind having a duals or just a dual tailpipes would be fine mainly for the look, but if it hurts the drivability then I wouldnt do it. I will use the stock distributor off the 73 but what do you guys think about the ignition and coil, should I go aftermarket like an MSD? Any aftermarket plug wires available, I dont really mind if I have to get a universal kit.