1972 318 need more power

Depending on what the cam is, it might already be "too big" and make a low end dog, AND a cam which is installed to the wrong "degree" (cam timing) can be a dog

As above............

The proper intake, IE something like an Edelbrock performer, or a factory 340/360 manifold

Not too big a carb

Good dual exhaust

And proper timing curve ............

will make the difference between a snotty little fun car to drive, and a complete dog.

An added bonus is gearing. Depending on tires / rear gear, something like a 2.73 rear gear is not going to be impressive.