I came across this information while searching the web a few years ago seeking information on 1934 Series 40 Buicks.
I found The document to be of immense help as it details mechanical parts which are common to the 34/35 series 233 motor and later 248 motors ( 1937 to 1953 ).
I have never been able to establish the author but have always been amazed at the detail that has been included, even a number of photographs and cross references to various parts catalogs
I have posted this before but it seems we have some newish 34/35 Series 40 restorers who may benefit from it.
Mark Simmons - you may find this helpful and worth printing a copy.