OK, I finally took photos of the two kinds of inline engine brackets I know of.
Unfortunately the engine-forward brackets are installed, and therefore hard to measure.
It's easier to visualize the difference if you follow the relative position of the center/top of the three holes where it bolts to the block, vs. the center line of the two insulator bolt holes.
*** The engine-centered bracket, the top/center hole is in the middle of the two insulator holes.
*** The engine-forward brackets, the top/center hole is much closer to the front insulator bolt hole.
http://www.wps.com/AMC/Inline-engine-brackets/engine-centered-bracket-left.jpg http://www.wps.com/AMC/Inline-engine-brackets/push-engine-forward-bracket-left.jpg
The on-car photo is the 63 rambler; it's yellow so it photo'd well. Funny, as I needed the "other" brackets for this install, but didn't have them (or know about them) at the time.
And when I recently moved the 258 in the 70 Hornet a few days ago, I could have installed these brackets, but it was a lot easier to simply redrill the pads on-car.