Considering I did my first hits using an ancient BG 750 and ran 9.6s short shifting I’d be amazed if the carb swap did anything for it. I ran a 598/4150 intake for years with a carb 1.48 venturi 1.79 throttle blade. We were pretty much 9.4-9.5 anywhere we’d go. On a heads up challenge race we entered I decided to try the old 4500/1050 we used on our W5 mill so I matched the 2” adapter to the intake and went to the track finding out we gained pretty much nothing and actually the 60 slowed over time slips from the previous visits. It’s unfortunate that I changed intakes and carb the same time I went from my 727 to 904 because it really picked up across the board. It’s now pretty much a 9.2 car but we’ve gone 9.09. Just shy of needing a chute.