Good eye. It was the only NOS Delco unit I could locate that wasn't over $400. That one is correct for 1974-76 cars if I recall. It's a CS. It's good enough for this build, and more correct than the current Inline Tube non bleeder master.
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey
1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles
2017 Sierra SLT 1500 Z71 4X4 
2019 Canyon SLT Crew 4X4 
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