I had a similar question but I talked to Cowl Gage Concepts because I have a 4" cervinis cowl and I want a cowl gauge. I was told as long as you don't have an extend cowl (comes closer to the windshield than the stock cowl) then it will be find. Shoot them an email or call them to make sure.
I'll ask them today.We just started carring their cowls,didn't have one here yet to toss on and try out. Need to add a tranny temp & boost gauge in somewhere,but trying not to clutter up the car at the same time.