Hi, I have a c/k 1500 98 silverado, and I am looking to make my engine better, improve gas mileage, make it last longer, MAYBE some extra horses. I just want to have a top of the line clean engine NOT NECESSARILY more horses and speed, it can but im asking advice on making it better in general not asking to JUST make it more powerful. It is I believe a 305 v-8 5.0 with an auto tranny. any suggestions?

 

put a 350 in it