HVH Super Sucker On 360 Magnum

well my engine is a 300hp crate 360 magnum that my father bought brand new from mopar in 2002. This engine has around 15 to 20 thousand miles on it tops. Intake manifold is the Mopar Performance Dual Plane M1, Carburetor is a Quick fuel Super street series 680cfm vaccum secondary carb. My jetting is 64 main 74 secondary. I did notice I had to increase the accelerator pump nozzle size when running this spacer. My jetting is based on being 4000 feet above sea level where I live. Quick fuel told me that it was jetted for sea level and to go down 1 jet size for every 1000 feet in elevation.