I'm not a mechanic but have to select the accessory drive system for my mechanic to install. Engine is SBC 421ci 619 hp EFI Car 95% street 5% strip. I want the AC mounted passenger-side top, alternator driver-side top and PS driver-side bottom. I first wanted a remote-mounted electric water pump but can't seem to pull that off as the serpentine belt drive systems I looked at have a mechanical water pump with attached pulley that's an essential part of the system so I'm going with a mechanical pump. I like the Vintage Air Front Runner system but would first like to know what water pump comes with the system. Vintage told me the pump was a Stewart "used by Nascar". They couldn't tell me which model. Stewart has 4 levels of performance they call Stages 1-4. Does anyone know what Stage Stewart pump comes with the Vintage system?