Vacuum question!

The Carter can be modified, mildly. Add on's help. But an 830-850 it will not be. If your not shy of trying something.......
The boosters are aluminum, they can be made smaller (Outside of the booster only) with a dremel. Make the round part smaller on the outside and the arm/leg skinny. all around. sides, top and botton. The idea, less restriction.
Do not screw it up for those parts are not avaiable seperate. You'll need another carb to replace them. (Parts carb)
The throttle blades can be made thinner.
A K&N stub stack and extreme filter set up help alot.