I sent in for the NJ DMV "package" for titling and registering kit cars (reconstructed vehicles) It said that the year of the engine used was what determined the emissions requirement of the vehicle. It also said that "proof" of the engine year would have to be presented. Are they talking about the engine code number (such as D0VE ,ford 1970) or the VIN# on the block which I am told matches the plate on the vehicle and the year ? Also , what type of bill of sale do you need to prove ownership/year of the motor? Has anyone in NJ gone through this process? Thanks