318 running beyond rich

Go get yourself a Eddelbrock 600 for your 318.
This will be just about as close as your going to get to bolt on and go.

Not going to start a Holley Eddelbrock debate.

Every Edelbrock I have put on a car has just about been bolt on.

And no, dont go buy someones headache carb. Try to get a new one,or close to.