3849704 64-67 Chevelle/65-70 Chevy Pass.
General Motors Part Number 3849704 Anti-rattle Spring

N.O.S.
Pictures and descriptions are from a new old stock
GM part.

Measurements

Anti-rattle Spring
This spring goes from the clutch release fork
to a hole in the zbar.

N.O.S. vs. Reproduction
Our part #2277 is a copy made in the U.S.A. It
is exactly the same except for the color.
Applications
3849704
0.844 SPRING, Clutch fork pull back
64-67 Chevelle (Chevy Parts Books)65-70 Pass. (Chevy Parts Books)
Disclaimer:
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!