Haha.... sorry guys, I got so many replies I'll put it on here so I only have to do it once. The end result is a 3 speed like a 39 trans, except it's bullet-proof, and has full modern synchros. Oh yeah..... and an overdrive!

In front I used an adapter plate from Macsspeed (also available from other suppliers) with standard early Ford throwout assembly, but with a teflon sleeve inside the throwout bearing carrier to accomodate the smaller F150 snout. Pressure plate and pilot bearing are stock but had a custom built clutch plate made that matches the F150 spline and offsets the center to accommodate the shorter splines on the F150 input shaft. The offset is about 3/8".
At the rear, I cut off the tailshaft housing, leaving just the tailshaft housing flange. I machined it flat, then made a matching steel plate from 5/16" plate and this was drilled to both bolt to the trans and bolt to the early Ford trans mount/bearing retainer. No gaskets in a F150 trans, so black RTV silicon seals it up. The trans tailshaft has to be removed and shortened, resplined to accept the early universal joint, and drilled and tapped to bolt the universal joint, same as early Ford.
The torque tube may or may not need to be shortened, depending on your application. The shifter sits about two inches back from original, so little that it's not really noticeable. I welded a 1938 shifter to the F150 shifter stub, and when the early Ford rubber boot is slid over it, it just looks like original.
Being able to shift into 1st while moving is great, as is the great downshift from 3rd to 2nd. 4th is 27% o/d on my trans (there are three models, mine is from the 302 V8 truck) and seems to give around 1950-2000 rpms at 60mph.
Trans from 300 6 cyl trucks have either 41% or 37% o/d and different 1st gear ratios. All are 1 to 1 in 3rd.
Hope this helps. My apologies for not replying individually to PMs.