Ok, i got the build package back from vintage vehicle services, the 72 is a custom, there was 17,734 monte's produced for US sale from oshawa, 138 with LS5, 908 with Z03, 503 with U14, mine has all these codes, i have 2 pages with all the options the car has, it was built oct 8, 71, shipped oct 15, 71 to Universal Chevrolet, Louisville KY.