A bit of Mopar History here for sale on Ebay THIS IS NOT MINE

Oldmanmopar said

Here are pictures of mine . They are not offset as the blocks pictured in the ad. Orange block is T/A- X the second is R3 - Resto. All 4 main studs are directly inline and parallel. The old way to put them on a standard web was to center the outer hole in the web where it is thick .. Check out the core plug location difference

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Right. But you can use an offset bolt main cap on ANY small block. Just because those blocks are drilled for offset bolt main caps did mean they aren’t T/A or later over the counter blocks.

There isn’t nearly enough detail in the pictures to say one way or the other what blocks they are.

It’s hard for me to believe that at the level of racing the guy was doing he was getting away will flimsy passenger car blocks.