That line is for the vacuum resevior to run the heating/AC controls. You can cut it, but then you won't be able to change the air discharge from the window/feet discharge vents to the dash vents.
Here is a diagram of my 88 GT to help you see where all this stuff goes......................
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Tom (Torque) Moss
88Gt 5spd Vert, FLowmaster Catbacks, stock cam advanced 4° @ 108.5° ICL, NMRA prepped GT40P heads 1.85/1.55 valves and 1.7 rockers, MAC P headers Jet-Hot coated, 97 Exlporer intake (ported lower), TB and injectors. 277RWHP/330RWTQ (SAE).
http://www.fastlanecars.com/
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