Austin morris fg lorry 1958

Fit an engine more powerful than original which alters the power to weight ratio by more than 15% and you will lose the historic MOT classification. Whether something like the ■■■■■■■ 3.9L 4BT will do that is open to question, that is if it will even fit. Something like a Perkins 4.108 might fit, but it is not well regarded. The better 4.236 is probably too big. The Ford 2.5 di is tilted to one side so would be awkward to engineer plus in non turbo form it is sluggish and the Opel 2.3 which is vertical, had almost the same reputation for cold starting as the Ford 105 E Anglia.

Stay with the Petrol. A sluggish Diesel will certainly be heavier than the Petrol engine so you will have the worst of both worlds.

Windrush will know quite a bit about these .