All the really cool and expensive Charger, since we are talking Dart, stuff is missing. Pretty hard to get a better distributor than a cast iron Prestolite distributor with the right curve and ball bearing vacuum advance plate. I have run a 284 duration cam in a 273, and found a smaller cam is much better all around, unless you want to make a drag racer out of it. Is that a solid lifter cam? 1.88 intake valves get real close to the cylinder wall, I hope he knew what he was doing... I'd also want stainless steel exhaust valves or hardened exhaust seats. I'd skip the headers and run the Charger single 2 1/2 exhaust system. Those little engines were bullet proof and plenty quick. Automatic transmission?