Fine Tuning a 360 Magnum with a Brawler "Double Pumper"

so I think I ruled out exhaust leak, I retightened all the bolts after I took the manifold off and it still sounds the exact same. I guess next step is to remeasure the pushrods? I thought you’re supposed to measure zero lash with no pump up but it sounds like a broken sewing machine so I feel like every lifter is clicking