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Jack, that round cowl would be original - the 'boxy' cowl front seen on the 320-07 in the other thread is a bolt-on!

I see what you mean there. I never noticed that before ...
The square bit is a dress cowl.

Yes, the air cleaner intake was sure different.
The old and newer design cleaners are shown here...

[Linked Image]

Brilliant.
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Jack