Knocking Noises

1. Check Starter Bolts
2. Check Flex Plate Bolts to make sure they are tight
3. Check for cracks in the Flex Plate

Overheating

1. Bad Waterpump especially if it happens at high speed
2. Worn fan clutch (if overheating at slow speeds) 
3. Broken or missing fan shroud
4. Clogged Radiator
5. Use a 195 degree thermostat.   Don't use anything lower as you will get bad gas mileage.
6. Air trapped in the upper radiator hose.   Disconnect and burp the system.
7. Transmission (the cooling lines connect to the radiator)