Welcome Not sure, but I do not think the bracket for a mach kit will fit on a Mark VIII. You might want to check on that, as I do not know of anyone using a Vortech kit for a mach1 on a Mark VIII.
I am having a Vortech 99 Cobra kit and a custom made air to air intercooler installed on my 98 Mark VIII by Aric Carrion at Injected Engineering.