It seems motor mounts are motor mounts. None seem to exist. I ended up looking rearward, specifically at the tranny mount which was standard toploader fare. Two bolts in a rubber matrix wrapped in steel.
I ended up gutting the oem ford transmission mount and reducing the height by about half, welding it to a .250" piece of steel plate, bolting the plate onto the transimssion mounting platform and thereby creating a net loss of about 1/2" in transmission elevation at the output shaft.
I haven't calculated the net degree change but the tailsaft face and the salisbury now seem to be at about the same (opposing) angles creating the proper phasing between the u joints.
I have had it out briefy and it is much smoother until about 3500 (where the serious power starts) and from there up to about 4500 it is somewhat rougher but not bad. I'm still under 500 miles and am not planning on taking it over 5000 rpm until I get a few thousand on the new engine, at least I can roll up some miles now without worrying about the driveline vibration. As far as the new mount transmitting more engine vibe I guess this was to be expected going from a rubber mount to a solid mount.
Either way all the off / light throttle vibrations are gone.
