Yes, I believe the last 6 is the sequential number of cars built. We we're hoping that somebody might be able to extrapolate what the block is by the sequential number or recognize the typeset. The typeset does look too crisp for a vintage Mustang era engine block! We know that the starter has to be removed or otherwise get down and dirty to find the casting numbers, but that is impractical at this time. I took a picture of the engine tag but can't find it, I'll keep looking. If I remember, the tag said 289, Canada, c code, which didn't match the heads or intake or carb. I'll try and get more information, I think there is a video but again, I 'm looking for it. Thanks guys, I'll be back shortly. All of you are great to help us, we appreciate your efforts.