With that size motor the wastegate he picked will work just fine for that turbo.
If you were trying to put a huge turbo on a 4 cylinder you need a big WG. Not the case with a v8.
Current ride 2000 mustang gt Built motor and on the bottle.
My former car. 04 focus 2.3 Duratec turbo. C
Wifes Car 03 ZTS focus ATX W/ E&S Turbo Systems Powered!!!