I have a numerical listing & component parts. I show a 80508 as a 4160, 750 CFM rebuild kit 37-754/ trick kit 37-921. primary jets are shown as .072/ Power Valve 125-65. secondary spring is plain. I have found that sometimes they didn't come with these components but it will give you a starting point. Remember Holleys come out of the box set for sea level. I find jetting down 1 jet size per 2000 ft above sea level is a good rule of thumb.