1993 Ford Escort Valve ticking after braking timing belt.

Car was running fine when I broke the timing belt. After replacing the timing belt the engine started ticking. Most of the time the car runs fine. Occasionally it will only run on three cylinder but straightens out within seconds. The engine is a non-interferance motor. Please help me. I finally figured out what was wrong with my car. The valve seat had separated from the cylinder head. I have heard this is a common problem with the 1.9's and the 2 liters. I pulled the head off and now I am debating what I should do. I will either have the head machined or buy a reconditioned head.