I would be curious to see the underside of the knockout for the hood hinge and spring. Appears the PO dropped in a rectangular knockout which may work fine with clearance for the spring. The original knockout was cupped, which from structural standpoint is likely stronger and less likely to tear. Also, it appears the spring sits lower on the forward bracket, which may not be a problem but is noticed difference.
While you are at it. Last pix is of 66 with aftermarket inner and outer fender. If you look close you can see where I had to pry (and damage) the fender to find the inner fender holes. If given the opportunity you might hang the front clip and get your gaps right(er) and then mark those inner fender holes.
