I don't mean to jump on an e body post, but I had a dog of a time finding something that would fit my 70 coronet. Same basic setup. 440, RPM and Holley. I did the same thing. Bought some different drop air cleaners and different filters with zero luck. I ended up milling off the choke horn and purchasing a spectra sheet metal plenum. Works perfect. It ain't the cheap route, but got it on sale at Jegs for $235. Air flow won't be an issue. Rated for over 1000 CFM.