That's a good question but I don't know the answer sorry.

 

If you wanted to keep the factory look, go for a factory four barrel intake and carb that's right for that year. You'll get better performance and fuel mileage from a four barrel as long as you keep your foot off the floor.

Don't toss the original intake and carb. I'd put those in a box next to your factory exhaust manifolds.

Of course, it would be much cheaper to simply rebuild that two barrel, but a factory four barrel will get you out in traffic a little quicker.