These old trucks have systems that are somewhere between perfect and extremely poor in condition. Generally if your truck tends to run around 180 deg. under load and when idling then that would be ideal. I don't know your location but I would guess operating in some areas of extreme heat would result in a little higher temperature.
When I had my rad done, I had it recored. Apparently the core design looks slightly different but I told them that it was not a problem. It is more efficient than the original and it all fit in correctly. If you do a search on here you will find plenty of posts where someone bought a new rad and something was different about it and sometimes it was a problem.
