I was not thinking the stock cam but the one he posted specs for

That is about as good as it's gonna get. The other cams listed give up lift and increase duration, bad things for low RPM The short duration is gonna help it make gobs of TQ at a 1500 cruise and the high lift is gonna give it some air flow for passing gear revs.

As for the gearing, if my Dakota that weighs nearly as much as the imp can handle 3.55s a 31 inch tire and .69 OD with a 239 V6 than surely a 440 in a slightly more aerodynamic car and shorter tires will be fine with a 3.23 and OD