Edelbrock Heads for 318

I would get a solid XE cam and the #'s are a bit different, it maybe a XE264S or something of the like.
As for the intake the street dom. is a very good intake and was the preferred one to use for racing because of it's HP and Torque producing abilities. There isn't much gain in another intake so save your money.
As for the heads stay with the 1.78 intake valves as they are 30-40 HP and torque better than the 1.88 and the port can't use this large of a valve efficiently. But do use the 1.60 exhaust valve as it's 40 cfm better without port work. Make the intake port opening to a 360 gasket size and being that your useing the older heads then you'll have to weld up the roof by the pushrod on top of the intake port down to the pushrod hole opening. The 302 heads have enough material so this doesn't have to be done.
Being that you want to run street type gears then keep the duration lower so it will make more torque where you need it, look at the RPM range of the cam and pick the cam this way as to where your driving is going to be mostly.
As for the carb I would use a 750 vaccum sec. as the mileage won't be any worse but when done right can work like a double pumper when needed.
As for Ign. systems this is just your choosing they can all work well. At a cost stand point the Mopar is the cheapest, and MSD the most expensive, so this is totally a preference of yours.