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I think they width looks pretty good. You say the fenders are off? How so? They look odd? or they are not the same or are not strait enough for you? I would spend time making them right before going back to ground zero with and allready finished frame. What about the rear? is it to wide as well? I would widen those fenders too if it were mine. A Camaro front clip would be the better option in my opinion if you were to go that route.
To make it any narrower, you would have to cut something major. Offset wheels would be the simplest choice if you don't want to start all over again.Nice project BTW.