As was said, measurements are key here. It is possible, but the fabrication that may be involved isn't quite worth the hassle. On a 60's truck, I would highly suggest extra support for the engine cross member to handle the added stress from the TTB D44 setup.
The coil sprung D44 TTB wasn't just an F100 thing, in fact, the majority of F100's were 4x2. The D44 TTB was more common in the 1980-1996 F150 and Bronco. For added simplicity, if this a long term deal, 1995-1996 D44's had bolt on brake calipers, which are much simpler to remove than the slide pin deals. I'm pretty sure the 95-96 knuckles will work with any of the D44 TTB arms, no matter the year. So if you plan to run this for awhile, i'd suggest finding some 95-96 steering knuckles.