I would like to say that when I pulled the 300 ci 6 out of my pick-up which weighed about 300-400 lbs and installed the 428 at 700 lbs I ganed about 300lbs on the front end, that's all. As far as a big hammer trying to make it fit, didn't even come into play. The hardest thing I had to do was to grind off the rivit buttons for the 6cyl mounts on the frame so I could install the mounts for the V-8. I grinded off the engine mounts so the headders would fit and since I am running 2 fours I had to grind out the fire wall area for the rear carb. The last major obsticle was getting the top loader to fit on the tranny mount.
All in all it was an effortless change over, and cudos to you for keeping the FE alive, whatever you run it in.
*note* Ford ran FE's up untill 1976 and never changed the chasis design for years after, so the FE will slide right in to a full size truck, bronco, etc.
Here you can see my 428 fits nicely in my 1980 pick-up.