Is your car and auto or 4spd ? Looks like it’s not A/C
And 71 A-body, 340, auto, N95 will have a bunch more stuff than just the Vapor return line (a 50-state item in 1971)
For an automatic car:
At least-
-vacuum control module on the passenger cowl with vacuum and electrical hook up
-Speed sensor tapped into the speedometer cable
-Vacuum block on motor
N95 stuff in 1971 is SPECIFIC to model, motor, and trans.
A 1971 N95 340 auto A-body will have more stuff than a N95 383 HiPo E-body.
