#3843942 168 Tooth Chevy
General Motors Casting Number 3843942 Bellhousing
Drivers Side View
Fork Boot Hole
Close Up Inside
Starter Nose Bump
The casting number is in a cavity, in the transmission
mating surface, and can't be seen with the transmission
in place. The casting number 3843942 in on digit from
the part #3843941, which is typical.
The part #3843943 fits this bellhousing and is one
digit from the casting number.
0.683 HOUSING, Clutch
1964/ALL ST. with 409 engine (Chevy Passenger Car Parts Book)
3843941 Use 3866982 07-65
Most parts that I describe and picture, have identification on or with them, others I can identify from other sources and deduction (educated guess).
Factory correct applications are your responsibility. GM made part and part # changes with no rhyme but a reason (no production interruptions at any cost).
Applications are for replacement parts that were available at the time of parts book printing, and when possible model specific assembly manuals.
My observations come from the parts I have in my collection or other reliable sources your parts may differ.
If Factory correctness is your goal, do more research, join car clubs, forums and buy an assembly manual if one is available for your Project Car (you wont be sorry).
This is a fun and interesting part of the hobby!