i got the 70mm accufab TB too, its all you'll need with an N/A setup. As for install, very straight forward. Only thing that was a pain was getting the stock hose over the TB, as its a bit bigger and the intake hose doesn't like to stretch.
the gasket that is on the intake manifold to plenum is reusable, its rubber, pull it out and clean it and then put it back it.