Here's a couple more photo's to stir the pot!
Underside of the OP's left front fender showing body seams:
Top side of a Kirkham fender showing body seams:
Seams look to match to me. Further more, most aluminum shapers seam the fenders down the top center. Kirkham seams theirs off center towards the outside of the car.
Here's a photo of the pedal box. Note the open bottom to the box. Original cars don't have a removable panel on the bottom, rather they are solid across the bottom. It was Kirkhams idea to produce their pedal box with a removable panel.
However, It was also Kirkhams idea to bolt their pedal box in on each end of the mounting tube. The OP's car is welded in. ???
Kirkham Pedal box:
Thoughts?
Larry