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The large hump in it for driveshaft clearance is going to hit the floor. Once you trim that for floor clearance then the driveshaft will hit it. I'm not sure how the frame is on a suburban but the way a 73+ truck frame kicks up after the cab to meet the bed also puts a stock 67-72 crossmember higher than it is on one of those trucks, which changes all the angles. I'm not saying it can't be done but its not going to be as simple as bolting it in either. If you are going to use a stock crossmemeber also plan on taking the arm mounts loose and flipping them over to lower the mounting point. That will help some and is a pretty common mod for those trucks.

I dont know of anyone whos put this suspension on a 73+ suburban so all I can say on your driveshaft questions is you'll just have to check it during mock up/install. Its hard enough finding info from someone whos put trailing arms under a truck much less a suburban/blazer.