Hello,
It can be done but is it worth it when it comes down to it. I would say it is if you can find all the parts at a good price. What year are you going for? If a 71 you will need the rear panel and tail lights,(the rear panel will fit from a 70-71) the side marker lights and a cut out removed from a 70 or 71, the fenders because like the others said thay have the dual head lights, the 71s had two styles one that was the barracuda and the other was the cuda that had the gills in the side, there are companies that make the sheet metal cut outs and the gills,.... now the fun parts... the lower valance panel is 71 only bacause of the driving lights in it. The header panel I have heard will fit from a 71 to 74, but not 70 do to the lower grill strip. then of corse you will need the 71 grill....Big bucks!....The bumbers and bumber brackets will fit from a 70 to 72 but the 72 had slots for the jack on the bumber.....It can be done if you are a good welder, but everything will bolt up just fine. There are some minor differness but to a untrained eye who is going to know....there was a few different things like
70 fire wall had no "E" stamped in it 71-74 did
70 hood hinges had no teeth gears but 71-74 did
70 doors had a curve to the door handels 71-74 were flat
70 doors...the belt trim had holes for push clips 71-74 had pin syle for clips
70 quarter glass had felt then 71-74 sealed with a rubber vertical strip
70 trunk lid had slots on the under side for the aar style spoiler
70 dash had it stiched barracuda then 71-74 had a glue on emblem
70 console had a holder for the seat belts 71-74 didnt
The interior had a bunch of mis. changes....But i would say the 71 would be easyer to do then the 70...thats if you were trying to look 100% correct. I hope all my rambeling didnt scare you! LOL I hope this helps.
later,
Jesse Lee
Cudaregistry