Spark plug gap space

Please help! Does anyone know the correct gap space for the spark plugs on a 1992 silverado p/u truck?

Look in the owners manual it will tell you. MOst GM plugs are set at 60 but the pre-90's were 45

Unfortunatly we never had one. We bought it used. We had to bring it to a mechanic because it eventually just stopped running in any gear other than low. They had to fix a fuel pump relay switch and the carburator and some other stuff. Hopefully we get it back tonight! It is costing over $800 to get this fixed!