Bill, I am not an expert on this topic, so maybe someone else will chime in. My take is that it's a 1970 block and that it could be the warranty block as the car would still be under warranty in'70. Likely, the owner's memory is not as good at it once was and the motor blew a little later in the car's life. Heck, I can't remember too many details of my first few cars and that was in only going back to the late '70's!
Either way, it's very cool car!!!
