The whole B20 engine will bolt straight into your Amazon, The port spacing on the head is identical an all versions of B18/B20 engine. It's literally as simple to conver an injection engine to carb as bolting the manifold on. You can get fancy and start pulling off the injectors and stuff, but you can also be crude and use them as plugs.
The alternator will only bolt onto a B18 block from 1967 onwards, I assume yours is RHD, if so the block needs two tapped holes above one another just by the timing gear cover.
Essentially a B18/B20 engine is identical. The bores are larger on a B20, the head has bigger valves, bigger combustion chambers and valve stem oil seals. The oil pump was upgraded, but is interchangeable. Then the very late 1975 B20 got a load of metric bits as production was geared towards the 240.
Other than the engine and gearbox little is a direct swap from 120 to 140, the steering idler is the same, but that's about your lot
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