I just did this a couple months ago. Cut out the welds on the C to rotate the housing. And I only have 6 inches of lift. But you have better pinion angles and longer droop available on the driveshaft angles if you do this. The C's would not budge after we removed the welds. We could even see the seperation line all the way around the tube, and the C was stuck on there. Even with some heat it and a puller, and a BFH, it wouldn't move. It took 60 tons on a giant 100 ton press to press those "C"s off the housing tubes. So it's not a simple task. I had my cousin who builds drag cars for a living weld the C's back on, I was afraid my MM211 welder wasn't big enough since it's about a 1/2" fillet weld.
Also, remember, the pinion will want to roll down on the front axle, not up, since the pinion is behind the axle and the ring gear is still being driven the same direction. So you'll want the pinion to point up 1 or 2 degrees in the front from the correct angle for your type of driveshaft.