I've owned my 65 dart for a while now with a 225 /6 one barrel Carter and automatic tyranny and 2:93 gears. I did a few changes on my car/engine : I run NGK nickel V groove plugs 0.035 Gap . Modified a Mr gasket 10" air cleaner to fit my little one barrel with K&N filter. Opened up my exhaust system just like the dart arrival in the latest issue of mopar muscle magazine. I bought a "had saver " vacuum gauge from my local speed shop to adjust my timing and the face on the gauge has acolor setting :red = bad yellow = ok green = good blue = best for the fuel/air mixture screw and idle. I set the valve lash when engine is hot and idling at it lowest point . I also put 2 3/8's thick fiber base gaskets under the carb to keep the heat from percolating the fuel in the carb on hot days easier starts just add longer bolts and a swivel from a 1/4 inch socket set on the carb rod. It purrs like a kitten
