You'll enjoy this, some genius at Holley decided to move the throttle bores in the Dominator throttle body. So the Dominator throttle body does not fit on a Dominator 4 hole spacer. The instructions don't say anything about that and I didn't see anything about that on the website. We caught it before we had gotten very far but it seems super odd. We'll just run an open spacer instead of the merge spacer that we always use.