It looks like there are two ways you can go. One is to shim the rear to get the correct pinion angle for a double cardan driveshaft. The other is to have a conventional driveshaft built for use with a flanged T-case output (I am assuming such a thing can be built--I cannot recall having seen one, but I expect it is feasible. A good driveline shop should be able to advise you.)
If you go the shim route, keep in mind you will need to replace the U-bolts for your leaf springs. Those are supposed to be replaced each time they are removed. However, since shimming the rear may be a bit of trial and error you may want to hold off the installation of the new U-bolts until you get the angle dialed in. IOW, use your old U-bolts for setup purposes until you are confident you have your final geometry nailed.