Thermoquad tuning on 318

Remy,
Going to the 098 pri jet is a good idea & will more than likely solve the problem.
Before doing that, you could try this: the small screw in the middle of the met rod hangar. Screw it IN 2 turns. If this helps/works, it indicates leanness. I would then go the bigger jets & return the hangar screw to the original setting.
Today's fuel is a different formulation compared to when these carbs were made. So jetting requirements are likely to change.