Suggestions, Finally have money to buy tires for the Dart !

I'm not sure a 225 will fit the front. In any event, you'll want to watch the tire size on the front with a 16:1 gear box.
nah, just overinflate them for a smaller contact patch!

all kidding aside, it'll be super close, but should fit. i know 215/60-15's are about the limit you can run on a barracuda with a cop wheel and even then you can't go too low