Cam upgrade?

looking for some help picking a cam out for a 68 440 going into my 67 dart, don't plan on big upgrades, just a refresh before it goes in the car, is something like this COMP Cams Xtreme Energy Cam and Lifter Kits K21-224-4 a good choice or am I wasting money by buying it all together? will have Schumacher headers, may do a efi kit on it also. Or am I wasting money just doing a cam? Are there better things to spend money on? Never put anything not stock together before on a engine so I'm looking for any help I can get