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you need to say what engine it has ( 4,v6,v8)
a qualified mechanic always treats an engine as intereference fit regardless because either engine can have valve damage when the failure occurs
If you have not broken a belt or chain and you set the timing marks up properly before removing the belt or chain and do not turn crank or cam/s after the belt/chain is removed there will be no damage done
that only occurs when the crank is or cam/s are turned without the connection to each other
the timing is computer controlled,the only timing marks are on the cam where the timing chain is,,check compression on all cylinders,because getting to the timing chain is a big job,its behind the water pump,here are some videos for you, 1986 cutlass 3 8L timing chain replacement
stick you finger in the hole where the oil fill is and have someone crank it over you should be able to feel the rocker arms move then if its moving check the crank shaft position sensor behind the crank pulley
I dont belive this 1986 monte carlo has a timing belt, this car uses the timing chain, the timing chain is good for 150,000 miles, the to check it for wear would be to remove the distributor cap turn crank with a wrench to right mark rotor then slowly turn crank to the left and watch how far the crank turns before the rotor moves, this is how to check the slack on the chain if the crank moves more than 10 degrees then replace the chain, these cars can go 150.000 miles before the chain is needed, and some go more. hope this helps.