Single plane on a street car??

Rani, I have a Holley Street Dominator right now on a 318. In most cases, the single plain is not what you want for a daily driver unless you have decent gears, good converter, or a stick shift car. However, the Holley SD is meant to build low end torque, thus the reason it's called a "street dominator". It actually does well on the low end..... however......
Here is the kicker: Even though the above what i wrote is true, the Holley SD only has 318 size ports as mentioned in a post above and wouldn't be my choice for a 340. The factory 340 intake would be better than the SD in your particular situation.