Sled pulling custom air to air

I have a 2.5 pulling truck (2000 Classic Chevy Cummins) and desperately needing to build a new intercooler for this year to replace the cheap eBay one. Been looking at bells site trying to wrap my head around what I should buy, my question is what do I need CFM wise and is it better to run a vertical flow that moves more air but is a shorter core or a typical horizontal flow cooler that flows less air but is a larger core? I have a 42"x4.5"x18" area to work with. From what I have found on bells site a horizontal flow cooler will only be about 1000ish CFMs. I could run a vertical flow that will be 2500ish CFMs but including room for the tanks the core would only end up being 10" tall. Any thoughts?









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