Cowl to Fender Gap Adjustment

[BT Classics]

1972 C-10
Something that has bugged me about the truck is this gap between the cowl and the fender. The passenger side looks fine but for some reason the driver side has this gap. The fender to door is fine too. If it was too close, you could shim the fender out. But with no shims in there, does anyone have any recommendations on how to help close the gap?

Also what should be unbolted/ loosened before trying to adjust? Wasn't sure if needed to remove things like the hood, grill, inner fender, etc.

Thanks!