Realistically you have a small displacement and low compression engine. An electronic ignition would be an excellent upgrade. Headers on your engine would be a waste of money. Stock exhaust manifolds and duel exhaust with turbo mufflers will give the sound of performance. If you want better performance consider a quality crate engine. Just my two cents worth. Been there done that.
If you're not worried about being original, in the late 70's I had a 283 2BC 57 we used as a tow car it used plenty of gas so I wondered about the economy of the 2GC vs a stock 327 4BC Quadrajet and manifold I had lying around. Swapped it over, picked up 5 mpg and trimmed a full second off its 1/4 mile time.
So, I'm afraid the 2GC is a dog, so if you want stock, go 4BC manifold with Carter WCFB (Rochester 4GC is just a 2GC with secondarys added). Exhaust make sure you have a dual system.
I have seen the Edelbrock 500cfm AVS carburettor used with an adapter on the old 4BC $GC & WCFB manifold and it could not be seen to be noticeably different to the 4GC.
The later 2GC wide flange carburettor will not bolt up to the early manifold, so thats not an easy swap.
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