Prepare for silly MPG though - at full throttle the performnce of identical Carb and full injection setups is pretty much identical.
Any other times carbs just aren't very efficent - I had a barking mad XR2 in my younger days with a load of head work / cam and a set of DCOE 40's and a full tank would barely last 150 miles !
But it was almost worth it for the the noise hmmmmmm

If my Valver wasn't a daily drive I'd be after a set of DCOE 45's for her

As for what you'd need here's a rough list ....
1. Inlet manifold to match the carbs you've chosen, these can be different if side or down draught
2. Uprated fuel pump - ideally a 'Facet' jobby
3. Fuel pressure regulator
4. the carbs themselves (ofcourse

)
5. Carb linkage assembly
6. Twin cable throttle cable
7. Air filter(s)
8. Trumpets for the carbs
9. Most important of all is to get the jetting and fueling setup right for your engine's requirements !
As you can see you'll need around £500 to get this project of the ground and plenty of planning and time. Might be cheaper to do a GTI transplant maybe ?!?!