You're very diplomatic and I appreciate that in all seriousness. As I pointed out very early in this thread, my car would fall exactly into your scenario and time frame, the only difference with mine and the 3 you have found is we know the back story without question. Yes, opinion but based on known/accepted history, I think you are barking up the wrong tree. There are many numbers engine cars in that same time so strange that only these were built with no VIN blocks. As for all the blocks have the same casting dates, I think it was mentioned earlier (or maybe another thread) that engine were only cast certain days and a bulk supply was cast on that day and then used later. With a limited usage block such as a TA block there are only so many casting dates that are possible, not sure the exact number of different dates but I cant imagine over a few so odds are up for them having the same date. I have nothing to support this but I would bet as much as 50% of these cars experienced an engine failure of outside influence and although some were warrantied not all were and most of the warranty ones I have heard of didn't get the TA block anyway. The tracking down of the replacement TA block in my thought may have happened years later or in a customer pay scenario.

Anyway, I've said my peace and will leave it at that.