I believe this is the one I bought for my '66 Suburban with the 454..........it was about 28 years ago, so it may be slightly different. Bit it is the same design I am talking about with a flat base. That way it clears the distributor with no issues. There is plenty of height under the hood for a tall air cleaner.
https://www.summitracing.com/parts/knn-60-1260