The front suspension is going to be either a D44HD TTB or a D50 TTB axle. Both are the leaf sprung version of the D44 TTB you have now. There are no coil springs on the F250s and none of them were solid axled. You will actually be going backwards as far as the front axle is concerned. The D44HD is more or less the same guts as your current axle. The rear axle would be a 10.25 and either a semi floater or full floater rear axle. The semi float would be a waste of time as you don't really gain all that much in load carrying capacity. The full floater would be worth the time to swap in....providing you can find a good D60 or maybe a D44HD axle for the front. The rest of the driveline is pretty much the same as yours. The engine, trans, transfer case is the same. I would suggest finding a late 70s F250 or F350 or an 86-91 F350 to get an axle from for the front and any full floater 3/4 or 1 ton rear.
99 F250 PSD 4x4, 5" DIY exhaust, CCV mod, DIY intake, PMT1 with DP Tuner chip (stock/40/80/120), BTS VB, Suncoast Extreme Trans with SD43 converter, FASS fuel system.
Trail Rig: 95 Ranger on Kingpin D60/14 bolt/D&D Doubler.