383s are dogs? Is that why the 68 Road Runners were such pieces of ****? Is that why the 343 HP 383 dual carb cars ruled Stock Eliminator back in the day?
Seriously?
Tune what's there first. The carburetor is about right for a street 383. It's not too small. Make sure your timing curve is right. You want "somewhere close" to 20* initial with around 34-36* total all in by about 2500 RPM. Get the timing right FIRST, or else all else will be incorrect.
Make sure the carburetor floats are not too low or high. Read the plugs and adjust the carburetor mixture and metering springs as needed. You shouldn't need to change metering rods or jets because they should be right on the money at your 383's mild power level. Once you get it all tuned correctly, I think you will be happy.