Yes.

Yessir! Sorry I'm late doing so!

dose the head need to come off to replace the lifter

The 1935 to 1941 parts list is full of errors and inconsistencies and is not the easiest thing to interpret but Group 7.100 shows part number 342930 for the right side most 1938 and 1939 models with 1940 not listed. Part number 342931 for the left side is shown for most 1938, 1939 and 1940 models.

So best answer is that 1938 to 1940 rear fenders from most models will probably interchange with 1940, assuming that the the missing listing for the 1940 right side is an omission in the parts list.

In my stash of keys, I found one that turns it (with some wiggling) so was able to remove the tumbler. Now that I have the key code, getting the key made is easy. I also tested the switch at the same time and it is in good working condition.

Thank you, Howard! So bottom line is to carefully remove the pin and I presume then it will be obvious what is holding in the actual tumbler.

Link to the Fender Section of the 35-41 Parts List. You'll find your answer there but my thought is those other years won't fit.

Will 120 rear fenders from 37 to 40 fit 40 convert 110

Yes, the 356 engine has hydraulic lifters. I had one collapsed lifter in my '49 [23rd Series] Custom. You can see the filthy oil gushing from the collapsed lifter in the photo. Made a heck of a racket. It has since been replaced, the missing oil canister replaced, and the gunk cleaned out of the sump. The oil is now a golden amber and the engine is very quiet.

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was just thinking it might be possible to heat the entire tongue so the residual heat might travel up the piece to expand the hole slightly before trying to drive the pin out. You would need to pay strict attention to the amount and where it is appalied as the pot metal melts a few hundred degress less than the steel tongue could take.