318 Runs Crappy at low speeds when hot.

Sounds to me like fuel related, IE vapor lock

Take a look at your fuel line routing, check your pump pressure and.......

CONSIDER A VAPOR RETURN SYSTEM.

If you have a late car with a pressure / vacuum cap, you might try getting a VENTED cap instead.



If you've disconnected the carbon canistor, you'll have a free tube from front to rear. You can buy two Wix filters, 33041 I believe is 3/8, and Wix makes a 5/16 as well. These two filters have a third 1/4" fitting which is designed for vapor return. Just plumb that third 1/4 fitting back to the tank.