Some guy here was doing it in a '90 or so model F-250. He had pics where he had seriously beefed up the front frame and he had to cut part of the firewall out to fit the engine in, so I presume he will have a big hump in the middle of his seats like the old ford vans had. I think his handle was c-series man or something to that effect. I couldn't find the thread though, so maybe you'll have better luck.