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Hi All: Vehicle in question is a 1941 Plymouth Business Coupe. I have clear WA state title that shows # P 11156703. That would be correct for this P 11 car. The shop manual for 41 shows an ID plate on the right door hinge post. I found that. It has # 15038062. The motor in the car has number P 12331158 which is a correct engine fora 1941 Special Deluxe Six in a P 12. I have a spare engine that came with the car. Engine # is P11 *(star) 32009A. The book shows that to be correct for a P 11 in 1941. The prior owner is deceased. I bought the car at his estate sale. His widow had no informaton on engines, work done, etc. So, no owner information is going to be available. If I were to guess, it would appear that the P12 engine now in the car is a replacement. And, perhaps the P 11 spare engine is the original? However, I do not want to make a guess, especially at the motor vehiicle department. Is there a hidden frame stamp engine or ID number somewhere? Is that door plate number the one they should use to register the car? it would appear that the VIN # that appears on the title would be the same as an engine number. It certainly does not match the door plate number. I am about to take the title and all papers to get the car registered. I would like to know a little more about registration numbers before doing so. I don't think they used VIN numbers back in the day to register these cars. I finally decided to abandon the 318 V8 install. Couldn't bring myself to do any firewall cutting or steering box moving. I am in the process of rebuilding the L head that is in the car. If that one is too far gone I will go to that spare L head that I have. Any information greatly appreciated Dick