Use the mk1 engine mounts, flywheel and a 16v pressure plate with a 8v clutch disk. Your g/box will be OK, use a 16v brake master cylinder and servo so the dist cap and leads clear. Get a specialist 4 branch manifold from one of the tuning firms, shift the fuel metering unit to the drivers side and use the inlet pipework to match. You will have to mess about a bit with hoses and things, but if you get that far, you are almost there

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Probably missed a lot of stuff, but have "man" flu.
Steve.