I have two 79 Z28s - my personal favorite year!
In 79 they dropped the LT model and replaced it with the Berlinetta.
The 79 model year produced the most Camaro's - that's why we still see so many today.
The Z28 was not a model it was an option but easily decoded using the VIN and Trim Tag
The 2nd digit in the vin would be S for Berlineta
The 5th digit would be a L for 350
The 6th digit would be 9 for 1979
350 LM1 - On the top rear of the block behind the distributor and behind the driver side valve cover is the block number. It will be hard to see while the motor is in the car.
Check the pad on the block behind the alternator to see if you can see the partial vin stamped there.
Here are some pics of a 1979 LM1 350
The gray tape is covering where the distributor shaft goes in the engine.
Behind the drivers side valve cover.
1977 - 1981 Z28 Engine (350) - LM1, 170 - 190hp
Block 3970010 2 bolt main http://www.nastyz28.com/camaro/z28lm1.html
Here is the partial vin engine Pad - Note that in this pic the Alternator on the right is painted blue.