I had no idea that any 105's had a 428 in the water jacket. A few years ago I bought about a dozen blocks from a guy who had them all sonic-checked by a known hipo shop, now closed. Three of them were marked, and the seller said those all passed sonic well within reach of a 428 bore. All are 105's. Now, thanks to George, I get to slither into a storage shed at 120º, knock out the plugs, and look for 428 stampings amidst hordes of Black Widows. Or, I can have another beer and screw it until October.