so i just heard back from the shop and they said my truck needs a new hpop. bein on a very small income im always one to save a dollar if i have a chance too. how difficult would this be to do by myself? should i use a stock hpop or is there a chance for a upgrade here? what would it do if i did use a better pump than the stock one? truck is a 97 7.3 with 261,000 miles on it.