these CMP's where not all Chevy's they where also built by ford of canada as well as GM the term CMP is Canadian millitary pattern trucks they where used for many platforms such as radio trucks ambulances gun carriers ammo carries troop trucks and gerneral perpose by the canadian and british forces
the long nose is Ford the short nose is chevy and from your build you are building the ford version
http://bcoy1cpb.pacdat.net/cmp_canad...ry_pattern.htm