['68OrangeSunshine]

My '68 C/10 w/292 L6 came with a manual choke. Did later models use an automatic choke? The L6s also had a heat riser on the exhaust manifold that, thru a bi-metal coil linkage, would actuate once the engine was at operating temperature [180-195*F].
I can't be more specific, since I converted to an Offy 4-Bbl intake and Clifford headers in 1978 -- scrapping the Monojet and cast iron manifolds, so I don't remember much.