Intake and carb swap

[BurnerBrown]

I am going to pull the truck in the garage in a few weeks and put dual exhaust on it to wake up the neighbors. It currently has the original 2bbl carb and I am considering a 4bbl swap when i do the exhaust. My question is will a 4bbl make a significant power difference? Any suggestions for an intake and carb to use? the truck is a 307, 4spd, 410 rear, 3/4 ton. If i do a intake swap, what else should I be doing besides a HEI ignition? I am not goiing to put a cam in it until i rebuild the motor, hopefully in a few years.