I have no issues with the 8.5 working on your sixpack. I wish mine was running strong right now. However, it seems like GEETEEX is looking for a stock appearing replacement because he mentioned the p/n? It's a 4 bbl and probably not a race car. Do you really think he needs to try a high pressure non-OE pump when the 6.5 at 120 gph will work fine and looks like the one he's trying to find? I'm just trying to answer his question about where to find a correct appearing pump. I do not believe it's a matter of maximum performance...but I did suggest the 3/8" line from the tank. By the way, I had the Carter 5903 7.5 psi on this car. No problems at 120mph in the 1/4.