Build date i formation help

I our purchased a 1971 Demon 340 with accurate vin and matching package tray vin and numbers matching 4 speed manual. The transmission says it was built October 25,1970? That vin number for thr 71 matches transmission. So was my car manufactured 10/70 for 1971 model year? I am working with MMC Detroit to get data plate made and i need a door sticker for vins production date. Need some direction here