My squarebore 600 Holley is a 0-80457S, and the brackets you need to make that work with the 700r4 are Holley PN 20-95, and 20-121. Not sure if that carb would be the same though, so make sure they offer the parts for that particular Summit/Holley model before you pull the trigger on that deal. It is of vital importance to have the right brackets to keep yours trans alive. It looks like a pretty good deal.