Hello Richard,
A number of suppliers come up as results when doing a keyword search for:
1940 Chev Truck parts USA
In the past I have ordered parts from Jim Carter's Old Chevy Trucks
http://oldchevytrucks.com/1937.asp Go to their website and type in
216 bearings into their search box and it eventually brings up a screen with a range of different engine bearings.
There is also an excellent forum just for old Chev trucks called the Stove Bolt Forum - there is a special section for
Tech Tips. https://www.stovebolt.com/techtips
I hope this is of some use to you?
Kind regards
Lionel