65 dart, fender well headers tire issues...

how wide of a rim for the 14'' is that a stock steal wheel?
A 165, is a 165, is a 165. That is the measurement of the section width on a spec rim. Its just that a shorter aspect ratio, 55 compared to an 80 say, means a shorter tire. 165mm is 6.5 inches, i think you could put that on a four to six inch rim. Your rim backspace will probably determine if it will work or not.