Bottom line here: Don't go too big with a cam. Stock 318 2 barrel cars can't stand too much of a increase without adding a 4 barrel, dual exhaust, converter, and rear gears. The cam you choose might not be that much bigger than the stock one and will be a lot of extra expense for not much gain. I have the same combination as you have. I already have duals and I switched the gears to a 3:23. It runs good and I get almost 20mpg/hwy. The next will be a 4 barrel and intake. I may stop there.
