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I just checked my service manual and the CVCC engine started in 1975, so that was the first year that the engine was able to cut fuel 100% while the car was engine braking and by that I mean that any time you take your foot off the gas pedal and the engine starts to slow the car down that the solenoids in the carburetor close off the fuel supply to all of the jets, to do this the key must be turned to "run" (so don't touch the key!) the oil pressure switch needs to see that there is oil pressure (oil light on the dash is off) the engine RPM needs to be slightly above idle, the switch on the clutch pedal needs to see that the clutch is not pressed in and there needs to be enough vacuum to keep the brake booster charged, as long as all of those fail safes are met the mess of vacuum lines will turn off the fuel so no fuel is being used while the engine slows you down.
So as long as you keep the stock carburetor and keep all of the vacuum lines in tact (something teenagers like to pull out to "clean up" the engine bay) your car will DFCO whenever you take your foot off the gas pedal.
If you would like I can dig around and see if I still have the dealer service manual on online somewhere that you can look at the wiring diagrams and vacuum hose routing your self, but if your car is stock then I can say for sure that yes, it has this feature.
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