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

abdywgn said
it looks like the blocks are not std factory blocks as the 4-bolt mains usually have the outer bolts drilled at an angle. where the bolts are drilled is straight down and they look to be "beefy'. did TA blocks come that way. ONLY 11,500 per engine core!

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