I have the original September 29, 1966 edition of the Chevrolet Dealer Price Schedule for the 1967 Corvette, and it shows $4141.00 for the convertible and $4353.00 for the coupe (as does the NCRS Spec Guide); my original window sticker (June '67-built car) also shows $4141.00. The "Corvette Black Book" shows the $4240.75 figure - don't know where they got it.
The base price doesn't include any destination charge, which was additional, and varied in those days based on the actual destination of the car; equalized freight for destination charge (as we have on current cars) didn't start until the late 70's.