[JoeC]

On the COPO document in CHEVY ACTION it appears to show 9737HD. The "HD" can be an ECL code to show a configuration change in the COPO number. Such as on the 69 Camaro 9561AA (4sp) and 9561BA (TH400). The Chevelle 9562 had eight different ECL codes. Chevy could have used a different ECL suffix code on the 9737 to build different configurations of the 1968 COPO Camaro. I'm sure they wanted to build at least 50 427 Camaros in 68 since the Hemi Darts and 428CJ Mustangs were NHRA legal. If Chevy built 50 of the "MV" 396 engines with the 850 Holley DP and open plenum L88 intake, they could have ran them in NHRA Super Stock. As far as I know, the drag racers were just using the RPO L78 396 Novas and Camaros in 1968.