2.0l M10 was in the 2002 and 2000
Ti versions come with twin 40 Del'ortos
Also fitted to E12 and 520s and E21 320/4
For Ԛ£600 I'd spend it on a full lightening and rebalance of the bottom end and flywheel, toughned rockers, heavy duty valve springs and some porting work in the manifold and head.
If you can find some s/h carbs, then the manifold isn't too expensive...(free if it's on a Ti motor

)