Boring won't help much. You can stick a 327 crank in your 283 block with new pistons to build a 307, but seriously your "best" (by best I mean the most bang for the buck) is to buy a complete 350 SBC motor out of a pick-up or SUV and stick that in your car with the 283 air cleaner lid on top of whatever air cleaner you buy to get a late model EFI motor running with a carb. Keep the valve covers if you have to (involves a lot of hidden work to pull off), and it will look stock even if it is a SBC 400 under the air cleaner.
All SBC engines 'rook a rike' so buying another engine is the safest way to preserve the value of your numbers matching 283, and it is cheaper than rebuilding the old 283 by far.
A new EFI 350 will have the wrong valve covers on it (because Chevy finally in 1987 decided to fix the old oil leak with your style of valve covers; they also fixed the oil pan corner leaks as well). You will need a different water pump that the one that is used on a serpentine belt motor found on newer cars (because your V-belt will run the new pump backwards, and V-belts slip and V-belts are getting hard to find so you might consider keeping the better serpentine flat belt). Finally you will need a new distributor and an intake manifold with a carb (because all new motors are EFI, just check to see that your choice in intake manifolds matches the number of bolts that hold down the EFI intake, because Chevy changed the number of intake bolts in 1996). I still suggest converting the 350 EFI you find over to a carb because it is simpler to operate, looks more natural, and even buying the new items suggested is still much cheaper than a rebuild.
Bigger is better. If you can find a stock two barrel SBC 400 in an old Estate Wagon, or an Impala/Caprice or a pick-up truck and it runs; grab it! the difference just bolting in the two barrel 400 over the 283 will amaze you! Rebuilt with all new speed goodies it might even scare you by gaining nearly three hundred horsepower just by bolting in a different rebuilt motor that looks a lot like your old one. Don't forget those FirePower 283 decals on the air cleaner.