I own a cam in my from them. I have a b2600i 1989. The only thing that you must know is that I ran into a issue with my stock rocker arms. I need to get roller rockers. Because of the grind that I had them do my "paws" or "feet" of my rocker arms are dragging on the way up and down, causing the valves to open too soon and close too late. I have since pulled the cam from the truck, but only because I haven't ordered rollers yet. They took about 6 weeks to complete my regrind. Here is a pic of it when it was new.
The other thing I ran into was because they remove material to make the new grind and my truck has hydraulic lifters I had to order valve lash caps from Manley Performance. The hydraulic lifters don't give enough "height adjustment". If the truck would have come with manual adjuster screws this problem would not exist. Although I think the dragging issue would still exist, thus still requiring roller rockers anyways. The reason the rollers will work is the radius of the roller is much smaller that the radius or curve of the standard rocker arms. Hope this helps. You got it easy..... I told you what you need....I found out the hard and frustrating way..... Although I need roller rockers it is not Paeco's fault. Just the nature of high lift cams.