Brian,
To answer your second question, our 4/4 4 seater left the factory in 1985 fitted with a 1600cc Fiat twin cam engine and 5 speed gearbox.
The engine number indicates that the engine was intended for a Fiat Argenta.

Jack
1985 4/4 T/C 4 seater Royal Ivory
1934 F Type
2018 Pembleton SuperSport (self built).