Success. OK I couldnt get the rear end out with the driveshaft attached because the clutch end wouldnt have come out. I didnt try to take that apart. I DID use heat on the driveshaft end (sorry George didnt see your post until I came back inside), it was the only way I could get the pin to budge, but quenched it in water to hopefully restore some hardness. If not, I'll have to source another less rusty shaft (or make a stainless one on my lathe?).
Got the rear pin out easier (no heat obviously on the input shaft).
As to supporting it, an impact socket wedged under the coupler worked perfect.
Got the brake pedal shaft off too, that was a lot of work, including power sanding the paint and rust off that shaft so I could slide (hammer/pb) the bellcrank off of it as it came out. The differential water came out too.
Now, the front axle pin is the issue.
The pin is stuck firmly in the axle. Blows with a splitting maul did nothing but pean over the end. It is very loose in the frame bushings, so I can make new ones and weld them on. Should I heat the cast iron axle center, the big stuck pivot pin, or do something else?
Thanks for all the help