that sucks i take it you havent REACHED OUT TO OR HEARD BACK FROM B&M ?
I made a thread that went more in detail, I called B&M (holley) while I had the truck apart, Spoke to someone who basically read me the instruction manual. Im thinking the guy I spoke to never has seen this pan before. After I explained my issue he told me that the pan was engineered for my truck, I talked to him for awhile and explained what I did and tried which was followed up with "it looks like you are going to have to return it for credit" It sucks because its a really nice pan. I guess if I got some longtube headers it would fit LOL