Smog tubes for SBC with A/C

[pzeitham]

Is there a difference between the SBC smog tubes between an A/C and a non-A/C car?  I am only finding tubes that state they are for non-A/C cars.

[rare396bronze]

Yes there is on the right hand  side only. 1968 and 1969 are are different also. Hard to find for 1968 but there is one right side on ebay. Hope this helps.

[Bernhardt]

The exhaust manifolds were unchanged between the three engines: base 327, L30 327, or L48 350. The manifold design was the rear-exiting "log"-type. The exhaust casting numbers for 1967 were 3892679/3893608 (LH/RH w/o A.I.R.) or 3892683/3872730 (LH/RH w/ A.I.R.). In 1968, the Air Injection Reactor (A.I.R.) emission control system (a.k.a. "smog") became mandatory for all manual transmission cars; the exhaust manifolds used in 1968 were therefore the same as the 1967 A.I.R. version: 3892683/3872730 (LH/RH).

The 1968 L30 and L48 A.I.R. pumps were identical, installing differently than the smog pump on the base V-8.
taken from CRG