[azcamaros]

Look for a single 3/8" fuel line (no small return line) that would help validate a Z-28 or L-78. Also look very close at the drivers side floor, in the area of a floor mounted pedal, for the two holes that would mount a pedal studs. For some reason I have seen several Z-28's that have had the pedal converted (after they left the factory)to a cowl mounted pedal. Also, count the rear leaf springs, the factory Z-28 spings should have five leaves. The rear end if original will also give you a clue. Look at the front side of the axle tube on the passenger side, a Z-28 should be a COO or COZ code, assuming it is a 12 bolt.

That is all I can think of, good luck.