That's quite a find.
Are you planning on selling those?

Sorry for your loss, ahtung.

A few notes regarding your late father's gear:
The 40mm is meant to be paired with the CL. No other M-mount Leicas have 40mm frame lines in their viewfinders. So you may want to keep the CL and 40mm as a set.

Check the CL for battery leak if it has not been used for a long time. Don't have to worry about the M3 as it doesn't use any battery.

And of course, check to see whether there is still film loaded in either cameras. I am not sure how this is done on the CL, but on the M3, pull up the rewind knob on the top left and turn it clockwise. If there is resistance then there is likely to be a roll of film still in the camera. To rewind the film back into its canister, flick the lever marked 'R' on the front of the camera, and turn the knob clockwise until you feel it loosen up. Give it a few more turns to ensure the film is completely wound into the canister.

Hope this helps.