Starting from the bottom: If the M410 was originally fitted to a
B30 (as nearly all of them were, in the 164), its bellhousing is
too big to bolt up to a B20. They look alike but are about an inch different in diameter. Quickest way to tell is to measure between
the top two bolt holes on the bellhousing and the measure between
the top two bolts on the engine's mating surface. They are about
1/2" different there but I don't remember the exact measurements.
I have changed several engines and one car over from FI to carbureted.
At the time it was my only choice. Now, if I had the choice I would
stay with the FI, especially on a 74, as it is a VERY trouble-free
system, probably more so than the carbs. I'm not absolutely sure but
I think it should be fairly easy to put the CIS FI system onto an
earlier FUEL INJECTED B20 (one that formerly had D-Jetronic injection),
but you will need all the stuff from the donor car as the system is
entirely different.
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