As title what's the limit of these carbs on a hot cvh

Wanted to spend and get throttle bodies but really thinking about getting a 400 conversion done on my mk2 frs

Spec on the cvh is
1600 cvh
Big valve cvh with 45mm inlets
Fully ported and flowed to match
Newman phase 4 4000/8000
Solid lifters
Double valve springs
Newman pulley
Rs turbo crank
Rs turbo genuine oil pump
Baffled sump
Bez tec dizzy
Arps
Fully lightened and balanced
Burton steel rods
Accrulite forged high comp pistons
Big valve cut outs
Skimmed head
Decked block
Steel flywheel
Janspeed 4-2-1 and system

And what pump and filter will I need to sort the fueling