Are you sure it's not a fuel delivery problem and not a carburetor problem? It could be a weak fuel pump, a clogged fuel filter or fuel pickup in the tank, or vapor lock due to the heat. You need to determine what the problem actually is before simply installing new parts.
Outside of fuel injection, there's nothing better than a properly setup and adjusted Q-jet for a street car. The key is "properly setup and adjusted". Not everyone can do that. There should be no reason that if your carburetor is the problem, it can't be properly rebuilt. Of course, eventually all carbs are beyond practical rebuilding, and that's when you should look for a replacement.
The advantages of having your own rebuilt is you know it fits...all the linkages and hoses have a place to fit and the fuel line connects without issue.
If you do decide you want an Edelbrock carburetor, you would also have made an excellent choice...they're simple, easy to adjust and hold their adjustments. The downside is you have to do some adapting to your linkages and cruise control connection (if your car has cruise), and you need to use Edelbrock's a/c kick-up solenoid if you have a/c...it runs somewhere near an added $100.
None of that is a big deal to do, but has to be done...and does add to the cost and makes installation a bit more complicated.
If you're still running the original intake manifold, give some consideration to a new, modern intake design. Not absolutely necessary, but you will notice improvements in power and drivability. Much depends on whether you have an L48 or L82. This can be a slippery slope of modifications...each one leads to more, so be very sure of what is absolutely your problem and what's the best solution.
