So I bought 2119 and all is well but I believe I may have a replacement 368. I have a paper air filter, a spin on oil filter, and the engine color is incorrect, nice but wrong. I looked for the stamped serial number and don't see one. So now I have questions: If it is a 368 used by Ford but NOT Mark II what does that mean for value, parts, work, and the shop manual etc?

In other words I know the Mark II engine was hand built and blue printed etc, but are the 368 engines the same internally as the Mercury Turnpike Cruiser and the Mark II?

If I do have replacement engine does this mean I have a pig in a poke???

Thanks. Jim