1973 Dodge Dart Custom Big Block

Bought this car in 2011. I am the 3rd owner. The previous owner said it was a 1972.5 Dodge Dart because of the front clip. No idea if that is true, or if someone installed the 1972 front clip. Built it to be a street rod. Need to install new inner fenders. I cut the inner fenders out when I was 26 years old. Had no clue what I was doing, and now I don't have a fender tag because I didn't even know it was important. Anyway, wanted the car to be a big block. The 440 I was going to...