>Okay, I should've checked this earlier, but upon closer inspection of the plate in the front trunk (near the smuggler's box) it is welded on.
Yay! Mystery solved. It really was a chop shop job! Judging by the dash, guages and warning lights, and lack of an oil filler flap, you have a '73 911 Targa. If only the car could tell its own story...I bet it's led an interesting life.