Yes - an option on all models, and standard on the Z28 i believe. But many Camaros of that era do not have original engines.

See

https://en.wikipedia.org/wiki/Chevrolet_Camaro_(second_generation)#1979

Yes. it was. Here's the info. Don't expect much performance out of that whopping 130 HP.....Most 4 cylinder engines today make that, just not the torque.

1979

The biggest changes for 1979 were the introduction of the luxury-oriented Berlinetta model, replacing the Type LT, and a restyled instrument panel with a much flatter appearance than the previous wraparound design (although the gauges themselves remained in the same places as before). The base models, RS and Z28 remained, the Z28s now came with a front spoiler and fender flares much like its Pontiac Trans Am twin had, and now came with "Z28" decals that ran from the beginning of the front flares to the bottoms of the doors. Electric rear window defroster became optional this year, replacing the old blower type. Sales for 1979 were the highest ever for any generation Camaro before or since, numbering 282,571 units. Engine choices remained with the 250 I6 standard in the base and RS models, with the 305 2bbl being an option and standard on the Berlinetta.

The good news is that you can put in a more recent Chevy used or re manufactured engine with nice stuff like electronic ignition and fuel injection and much more power - the 350 is very popular and should fit just fine.