You mentioned in the beginning of an oil leak. Now would be the time to address that. Give the engine a complete and full maintenance to make sure everything is in top shape. If you don't have any history on the car, you might want to consider doing a Seafoam treatment to reduce any oil sludge or other buildup over the years/miles. Also consider changing out front and rear cam seals after the cleaning is done.

When you did the timing belt, what also was replaced? Water pump (get one with metal impellers)? Tensioners? Accessory/Serpentine belt? Coolant flush? Look into doing a flush on all other fluids (transmission, differentials, brake, etc). Remember that brake fluid should be flushed out every 2 years regardless of miles for proper safety.

Just thought I'd mention it since you have the front opened up.