So I just got the first cam swap done, experimented on a 09 3/4 ton 4x4 service truck I am selling that had a bad cam and it is running awesome, the roads are wet today and even from a 35 mph roll mashing it, it is spinning all 4 and getting sideways in a very heavy truck with 285-70-17 tires. The idle is barely noticable. Got to wonder why the factory didn't do it. I used a new set of 5.7 springs, the local machine shop tested a couple and said they were within a couple pounds of the 6.4 spring and they were way cheaper. Every single part is from a 5.7 except the actual cam it'self so that $68 cam should be all you need to buy besides gaskets, I would recomend new springs just to be safe.