Since I don't know/understand much about picking a camshaft, my engine rebuilder suggested this Melling:
View attachment 1716318140
He said it would be a good choice for my ice cream parlor cruiser (.030 over original 318, LD4B intake, 1406 carb, MP electronic ignition, factory exhaust manifolds, FlowMaster 40s, 2 1/4" pipes, A904, 3.55:1 sure-grip 741 case 8 3/4" rear end with P245/60R15 tires (15" X 7" WheelVintiques Rallye wheels).
I've never checked the gas mileage, so I can't share any information on that point.