A) As stated in your other topic, Chilton is wrong... period. No, none, zero Rabbit Convertibles came with the JH until the 1984 model year.
B) All 1979-1993 convertibles were built in Germany... period.
C) As stated in your other topic, only the 1980 Rabbit Convertibles came with a gas 1.6L. The 1983 car in question would have had a 1.7L EN engine installed at the factory. What it has now, 30 years later, who the hell knows unless you obtain the engine code.
D) As stated previously, all 1981-1989 convertibles have an "A" for their designated engines, which merely means "lowest output, gas". For the convertibles, the engines are:
1981-1983: 1.7L EN
1984-1989: 1.8L JH