No good if you want a responsive unit as it's a bit of a lag slag, but a bit of gas would sort that out, in my honest opinion it's to big for most GTT engines for what people expect/want. Good for power figures though

You'd need a decent cam & a strong engine to rev it high enough to benifit from it, it's the rear housing thats a bit of a problem being .64, idealy you want a .47 or a .49. I have a .49 rear housing & i wouldn't enjoy the car half as much if i had a larger rear housing, unless it was a VNT
Up to you though, it is a good unit but don't expext it to do anything till 4k + rpms