"XC06944" was part of the the second batch of '69 500's and 350's built from mid-December 1968 through to around the end of January 1969.Frame # XC06944 T400R F4161
Uh-uh, not an engine number.Not seeing
raised area with an engine #
If they're raised, they're the original casting part numbers; if they're stamped but don't match the numbers of the corresponding parts in the '69 350/500 parts book, they're WIP numbers.inside the motor case 70-9035
on the Cylinder Head it has E695
If you mean the plates that mount the engine in the frame, they're loose on a 350/500, they bolt to lugs on both frame and engine.Not seeing an engine plate,
Either your're or I am ... this:-have a T100 frame which the rear frame tube was cut off just behind the the support tubes that go down to the bottom of the frame
... shows a complete bog-standard T100 frame.