When there is a wrong bucket ( from an early build Pantera you can see this easy because the gaps , but it's possible the fill the caps with bondo.
think your problem is the fender , maybe not good installed/welded or it has a big dent.
US carshops usual use more filler on a car than on a house .
when everything looks OK, than your problem is the bracket between barr and bucket .
when you grind this backet from the barr and bring it a little to the front of the car, maybe 1/2 inch and a little upwards than the headlight goes closer to the fender when they are open.
easy to say , but takes hours of adjustment.
also it;s possible your bucket has a dent on the area where the bucket meets the bracket.
I just was restoring a 72 Pantera, 2 different front fenders , when I bought this the headlight system was deleted.
I bring back everything as stock, but it was taken a couple of days of thinking , adjusting , welding, grinding apart, and again, and again.
Simon