I haven't owned 407 or 408 but I thought the engine was very similar to the 409 / 410 in most respects. My understanding was that the block is the same but just different bore diameter. Someone please correct me if I'm wrong.
Are the difference due to subtle refinements or are cylinder heads / cam / crank /oil pump etc not interchangeable?
The one difference I am fairly sure about is that the aperture at the rear of the crank is different between the 407 / 408 with cast iron gearbox case and 409 / 410 aluminium gearbox due to different torque converter.
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