He is wrong. The choke mech didn't move to the side of the carby until ADR27A engines were fitted. These are the ones with the exhaust crossover in the manifold, fitted from 6/76 in HX and LX but a few very late HJ's got them. As yours doesn't have 27A on the ADR plate it has the standard 1975-6 HJ engine with the divorced choke mechanism.