318 engine running rough tips??? Trouble shooting...

1st, if the plug wires are in the right order, timing is somewhere close to right....

The carb was built, but you need to dial in the mixture screws...and make real sure the base gasket is correct and sealing.

If it was built 7 years ... lol... time to build it again, though you could spray a little wd40 around the carb gasket and or gaskets of carb and see if it smooths out and or revives the gaskets.