Air cleaner location depends on the engine and if it's dual or single air cleaner. Single air cleaner Detroit 8v92t had left air cleaners as would single air cleaner 3408 Cats. The intake side of the turbo on both those v 8s face left simplifieing plumbing. The Luberefiner could be anywhere including in front of the left battery box on the frame if the truck was equipped with one as spin on filters were becoming available. Another factor could be if the truck is a 119" or 127 bbc. The Monogram kit is the 119' bbc. Our resident Pete expert Tim could tell you much better than I can.