[Don]

Have an understanding of your predicament as when I attempted to register a pre-owned Cobra from out of state, that was legally registered, did not have the correct paperwork on the engine etc. While it was a tedious experience, in the end , everything was handled exactly according to the law and obtained the registration w/o any future concerns.

Not knowing the MA regulation, if the option selected is another engine, CT follows the Federal regulations in that only pre-1966 ( 1965 and earlier ) engines and factory heads did not have any Emission regulations and hardware. The Bill of Sale had to be very specific as to the engine codes, year etc and the sellers info, if a business , on their letterhead is a plus. I know of one individual that had the actual VIN tag from the vehicle the engine was obtained from.