4 Barrel on a stock slant

IMO, the Holley is a mistake on small engines like the slant and even a 318.

The Holley is a square bore carburetor, meaning all the barrels are the same size. The slant will respond better with a carburetor that has smaller primaries, such as the smaller AFB style carburetors that Edelbrock makes. The 500 would be a good choice.

Some may say it's too big, but since it has small primaries, it will work well. They are more forgiving on smaller engines.