Not all air cleaner tubes are created equal
Here is a comparison of two presumably small block heated air cleaner tubes. The white longer unit is correct for 4wd 1970-72 350 engines. I'm unsure what the other tube, which is black and shorter is correct for. The shorter black tube bolts on and fits the air cleaner, but it will clock the air cleaner snorkel closer to the brake master cylinder.
The original tube on my 1970 Blazer 350 was rough, so it was discarded. Fortunately, I had 2 spare correct long tubes, and 2 shorter tubes.
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1970 K/5 Blazer CST 4WD, Bronze, 93k ACT. miles, 350, 4 speed, positraction, 16.5" x 8.25" wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration in progress... 
1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 
2017 Sierra 1500 SLT 4WD, Black, 41k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2...
2019 Canyon SLT 4WD, White, 60k miles, 3.6, 8L45, 3.23 LS, 18" wheels
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