I decided to begin installing 2-piece pushrod tubes for a couple of reasons:
1) I have worked on the engine and heads enough that I'm afraid every time I re-stretch the bellows on the stock pushrod tubes, that I will weaken the metal and cause fatigue cracks.
2) With the stock tubes if I need to replace pushrod tube seals then I have to loosen the heads and then have to go through the torquing procedures again.
I had time this day to replace the tubes on the right side. Next time I have some warm weather I'll do the left side.