1971 dart/swinger...340 4-speed

My car is a Canadian built car, no Swinger 340 Special though...VIN# starts with LL23B1R. Originally a /6 with 3 speed on column. I know the guy who tried to clone it into a 340 Swinger, installed a very nice built 340 but didn't go a very good job of finishing the project. Now I'm just trying to finish getting it the way I want it to be. Would love to find one of those originals....would be an awesome purchase.