hook up a vaccuum gauge, establish where the power stage tip-in is and try to keep out of it-gonna be tough with those gears up the hills for sure, maybe along the flats too-but thats about all you can do as well as keeping a steady foot as to not wiggle in too much accellerator pump. The little primary (if it is a little primary)should make it easy to monitor. Dont go crazy on leaning the main jets for max milage-dont wanna burn the exhaust valves on the long trip

little slip-sticking shows 31.38 mph per 1000 rpm so 70 would be 2231 rpm- should make Hank happy and perhaps new motor will enjoy it too.