Lee,
Not sure if the TP Roller Rockers will prevent, for if not mistaken on mine that is what it had originally. Could be wrong but my understanding it was the Rockers that occasional cause the geometry problems and created the side loading on the valve which leads to excessive and uneven guide wear.
When they changed mine, they changed out with all S&S componets from roller rockers, valves, guides, springs, heads, etc. The only think tha ended up staying was the boxes. When I asked the dealer about why the boxes stayed TP, they said that the problem was not the box, but the rocker geometry itself and due to my boxes were still good, that BD didn't see the need to replace. Made sense to me and I like my TP boxes anyway.
Now since my dealer is very good and the Service Manager has been dealing with BD and many other V-Twins for many years, no reason to doubt them. So far it all seems good. Will say that when mine acted up, they were not that bad, but did seem to have gotten worse, and yes I did keep the pushrods adjusted.
At that time BD was no longer just changing out heads and componets wholesale due to noise. They had the dealer do all kinds of checks, for from what i uderstand they were gettting many heads that were supposidely bad only to get them back and find it it was not so. My dealer did a blow down test, measured the guides and a few other things and the guides had exceeded the upper limits for out of roundness (or at least that is what I took away from conversations).
So far so good, but I have notice since I owned it that as I get more noise in the top end, just a quick adjustments of the push rods seem to be the ticket overall. Also since day one, I was concerned about the noise and found out it was normal due to various factors and having rode a few others BD, did see they had more noise than most of my previous rides.