The Cowl Tag is fine for that VIN car. The Z10's are unique in that they were all ordered at the same time and then built over a couple of week period at the end of April, beginning of May. In 69 body numbers were assigned when the build order was accepted by GM, not when the car was scheduled to be built.
My 04L Z11 has a body number of 317xxx and is only 500 VINs before this car so comparing body numbers between cars in 69 is not always possible, especially when dealing with different models (ie X44 to X33) as some cars just didn't get built right away.
Nice looking car and it will probably bring good money, but you would think on high dollar restorations someone at the paint shop would check out how to paint the rear stripes on a Camaro, they are to close together on this car. (67/68 style). And it doesn't have the Ford "Caution Fan" sticker on the radiator shroud.