Small Block Intake

Looking at the combo info you provided, it seems 'performance' is the goal. The cam could be the limitation here, so going to a RPM intake &/or bigger carb may not do much if the cam is too small.

I see a thick spacer under the carb. If it is a 4 hole, converting it to a 2 hole will allow the engine to 'see' all the carb cfm & should improve top end. This might get you where you want to be using existing parts & should certainly be tried first.