My "new" '74 Duster- or why I need a project like a hole in the head

Yeah...I think 275 is a bit much for me. Maybe I'll run a 235 or 245...

245's are a pretty popular size, lots of 245/40/18's or 245/45/17's available. Run with a 5.5"-5.7" backspace on an 8" wide rim and there should be plenty of room all around.