The stamping on the trunk extension and core support is the VON, not the VIN or sequential number (last 6 digits of the VIN.)

I'm pretty sure the only way to marry the VON with the VIN on 68's is via broadcast sheet, which I'm assuming you don't have?

That tag is for your car. 68 rr, 4 spd, 383/4, pb, and something else - "7" on the first line (h) is that hood mounted turn signals?