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.
I photo'd the drivers-side only.
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.
I held a little square up to the top/center hole in both photos.
*** 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.
.