Here's a photo of the D code Ramcharger before I swapped the G3 in to it. Big block 4x2 uses the back holes in the Crossmember.

With the 4x4 mounts you should be able to use the front holes,
the bottom photo is of a 4x4 Ramcharger converted over to 4x2 and I used the 4x4 mounts in the SB hole(forward holes).

BB MOUNTS HOLES.jpgbb 4x4 mount.JPG
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