If the engine is basically stock, and you have any concerns about either fuel economy or low end driveability....stick with the original Rochester.

Depending on what year 283 intake manifold you are using, you may also need an adapter or change intakes.

Jon.

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop