Bob and DWR have offered acurate and useful clues. Looking at the firewall pix, I see the pass. side cable clip, but no speedo cable hole. On the driver's side I see a cable through what appears to be an original cable grommet, indicating either a Saginaw 4 speed or T16 H/D 3 speed (assuming it is a floor shifted manual trans car).
Having a cable clip on the incorrect side is not unheardof.
My thought is that IF it were an L79 it would have had the H/D three speed, but much more likely to be an L30 Saginaw 4 speed car.
All considered I would say this is not likely an L79 car, and even if it were without docs or any of the original drivetrain there wouldn't be any significant value added. Go ahead and build your race car!
Good Luck! - Bill
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