This is an aftermarket squarebore , i can see where your spreadbore would work. But this one is prolly longer, i was on the phone with a guy who had a holley and an original air vleaner, he tried and said it wssnt dished enough to drop down on the holley, wish i had one to try, a small spacer might work, but might also hit the hood!
Oh well, open element it is for now....