Works on most carb`d combo`s too!
Back about 20 years ago, I had a pretty much bone stock 69 Mustang Mach 1, with a factory 428 Cobra Jet, C6 auto & 3.50 gears. It also had the functional "Shaker" hood scoop that sits on top of the air cleaner housing, & allows outside air into the air cleaner (or directly into the carb if you removed the filter & air cleaner lid) If you are not familiar with the old 352-428 Ford "FE" engine family, they have a very wide intake manifold that actually goes about 1" per side under the valve covers, basically as part of the cylinder heads(the pushrods go thru the intake manifold). Anyhow, it may be partially due to the extrawide intake getting warmer, but I sometimes layed towels on the intake manifold and filled it with ice, as the ice melted, I removed it with a turkey baster, & kept adding more ice, until shortly before it was time to make a pass. Even with the factory cold air scoop, it was common to pick up 1 to 1 1/2 tenths and 1 mph with the intake iced down. Now, on a carb application, this helps cool the air AND fuel mixture, whereas a EFI intake just has air going thru it, but it defineatly worked. On my Mach 1, it went from 13.5-6 ET@101mph, to low 13.4`s at 102mph, on normal everyday 14" radials (no drag radials or ET Streets back then!). Even on my low 10 second 428 powered Fairmont it`s worth almost a tenth. Interestingly enough, I had tried fuel "cool cans", which made no noticable differance. Although the carbs float bowls would be cool to the touch in the lanes, I believe that the fuel that had time to cool down was used up by the time the car was driven to the burnout box, & staged.