I'm no stamp expert by any means but nobody in their right mind would try to re-stamp CRV 4 speed block into a CRR automatic block IMO. And the KC stamp looks legit to me since it has all the "tells" I know of for a KC car. For the kind of money these cars bring why would anyone buy one without Rick or Chris to authenticating it first?

The car in question, the blue LS6 Chevelle coupe, is an automatic. If it's indeed the original engine that was incorrectly stamped at Tonawanda, not hard to believe that someone over the years made a misguided attempt to 'correct' that error. Would have raised less suspicion to just leave it as it was, IMO.

Rather than someone over-stamping that letter years later, seems more likely to me that either

(A) it was mistamped at Tonawanda and corrected at Tonawanda before shipping to KC, or

(B) it was correctly stamped at Tonawanda as initially built (as a manual engine), but for some reason was changed to an automatic before going into a car (either changed at Tonawanda before shipping, or changed at KC after it got there), and that letter got over-stamped then. July 2 is very late in the production year, so maybe they checked orders vs. inventory and had to change one or more manual motors to AT motors to meet the remaining supply needs?

Auctions have ended. Big numbers on a few of the cars!

Do they report their auction results anywhere?
All I'm seeing is promoting future auctions.

Me as well. I don’t need any tractors but I sure would like to know what the LS-6 El Camino and Chevelle sold for.

Bill

The El Camino went for a little over 90K. Not sure about the coupe.

$98k IIRC...

Full results apparently can only be seen if you are logged in with a seller or bidder account. Summary below:

70 Boss 429: $442K
70 LS6 Coupe: $98K
70 LS6 Elc: $90.5K
69 Camaro Pacecar Convert: $66K
69 Impala SS427: $53.5
69 Impala Convert: $36K
69 Camaro SS: $38.5K
68 Camaro SS: $32K
69 Torino 428: $29.7K
69 Cyclone 428: $43.7K
68 Camaro RS/SS: $42K
67 Elc L79: $53K
70 Camaro SS: $91K
57 Chevy pro street: $78.5K
69 Camaro L78 project car: $28K
55 Chevy: $41.5K