Congratulations (or condolences) on tackling this job.
I made a puller using the front and rear flanges from a 55 Buick torque tube. Using this method, forces are directed through the front pinion bearing and this could damage it; I have used it on 3 R&R projects and loaned it for 4 other projects without any issues. The other way that I used before this was to have a driveline shop cut off the tube (shaft), press the remainder off the pinion and then weld the tube back on after pressing on to the pinion ($$$) and then straighten the shaft.
You will not need heat or a BFH using the puller...let us know if you have any other questions. (the puller is shown installing)