The RPM range on a 454R is not 3500 to 8500 it is 3500 to 8000 as is the Victor 454 2-R, the Super Victor is 3500 to 8500 and the only one that is 4500 to 8500 is the ram 2-R and It is pretty clear the one you have is not a tunnell ram. So the intake you have is 3500 to 8000 regardless whether is says R or 2-R.