From prior posts I have been able to establish that the engine in my '67 GTO is not original. In reading my restoration books and now having the front of the block cleaned up so I can see the stamped numbers at the lower front next to the timing cover, it would seem to me that together with the "242" beginning of the VIN number if the records existed somewhere one could find out what vehicle the engine came from. I have dealt with PHS for two GTOs I have owned but it seems to me that they figure the stats going from the VIN number (the opposite direction). I know now that I have a 1970 RA III motor and that based on the casting dates it is likely the #12 heads are the ones that came on it. As stated here before the over-stamp of the last block casting digit (to make it read: 9791115- can't tell what the last digit originally was) still is not clear, but I was told here that it was likely a rare block. As I have continued further into the cleanup and inspection I found more interesting stuff. I can now see that on the deck directly below the center of each cylinder there is a capital letter stamp. There are some that are the same, some not and no sequence of any kind. Weird or not weird? Marking deck clearance or piston height at TDC perhaps. The bore is standard, but the pistons (flat top)have been out I'm pretty sure because the rods and caps are marked with prick punch dots and the crank is marked M10 R10. I have been kind of struggling with the decision of whether or not to use this engine in my '67 restoration because it is clearly not going to be a matching numbers or a show winner and I do have a '75 400 motor with '67 061 heads that I could freshen up for it to have. Once again I must ask 'what do ya think?' All (serious)opinions appreciated. HAPPY NEW YEAR!!!!!