Will the 2.0 runners work from my fi system work with the 1.7 carb and manifold?

Yes but not very well.
How fast can you run breathing through a straw?

You really don't want the two barrel single carb Matt. It works, and is fairly bullet proof, except for cold weather, but your engine will run very doggy from low rpms. The intake runners are so long with that set up there's a huge bog if you accellerate hard from low rpms, you'll hate it.

Ohi know. That's why i swapped my car to FI. In just trying to sell my carb and some guys are throwing questions at me thy I don't know