So it seems that you are pretty washy about what you want to do with your truck. a few days ago it was should "I sell because of frame damage". I know prior I have seen you post other similar questions.
What I would do if I was you is sit down and decide what direction you want to go in for the truck. We can't offer you advise if you are waffling back and forth.
is the p710 a good pump? Yes it is a good pump
is the VP44 a goog pump? Yes it is a good pump
Are they the same? No they are different, both have strong points and draw backs. For me reliabity is not a reason to go with a p7100. A modern VP44 is considered reliable. Keep in mind that lots of us have north of 100,000 even 200,000 on an injection pump. Is any part that last more than 100,000 really that unreliable? "Man I only got 100,000 miles out of my unit bearings" people don't yell and scream unreliable, they say, "yea that's about what they last."
How many 2nd gen trucks do you see on the side of the road? It's not like the vp44 just up and decides to quit the vast majority of the time. Normally you have signs, codes, etc. Replace the part when it goes bad and move on with your life. if you try to plan for the worst and work towards making your entire truck bulletproof, it will never leave jackstands. Just drive the stupid thing.
As a side note if you are needing to be worried about anything on your truck I would be worried about that K & N filter that you have....They are garbage. You are worring about a VP44 when you are literally running an air filter that doesn't filter....
K&N Air Filter Review - Debunking the Myths (and why OEM is better)