You have an L48...no matter what you'll do you won't see a huge increase in performance without cam and cylinder head changes or modifications. You can do things with intake and carburetor that will make it be more responsive and smoother, though not necessarily much stronger.
The Edelbrock Performer is one of the few intakes that will work without causing clearance problems with the hood. If you want to keep the stock Q-jet, it's a good choice....all fuel lines, vacuum lines and linkages will work as designed and simplifies installation. The Q-jet is an excellent carburetor and one of the best for the street. Have it rebuilt by someone who understands them and you should be quite happy.
If you want to change carburetors, get an Edelbrock Performer 600 with electric choke. That's an excellent street carb in its own right...simple and holds adjustments. If you go that route, get the Performer EPS intake manifold...it's designed specifically for and optimized for the Edelbrock square-bore carbs. It has somewhat better horsepower and torque number than the standard Performer intake, but not by a lot.
The downside to changing carburetors from the stock Q-jet is your fuel lines have to me modified some, the linkages will as well. None of this is major, just needs to be taken into account. If you have a/c, you'll need Edelbrock's proprietary a/c kick-up solenoid...it's different from the original. All those changes add up to additional cost, so figure that in.
Any of these choices will allow your engine to run smoother and stronger, and will wake your engine up a bit. Don't expect miracles but you should be quite happy with the results.