I really dont know anything about these motors as all my experience is with older chevy stuff. Your car has a distributor? If yes, put a breaker bar on the crank pully with the distributor cap off, and try spinning the motor over with the breaker bar, going both forwards and backwards. You should be able to see the distributor rotor rotating with the engine and how much (if any) play/slack there is in the chain. If it does not turn..
Timing chain.