Yes, it matters. The Alda line has to blow out the vent in the top when powered, the manifold shouldn't.

The manifold to lower is how my car is plumbed, I just looked, but it might be wrong (works though). Whichever one blows out the top/vent when you apply 12v to the solenoid is the one to the Alda.

There is a picture here somewhere.

here it is:

ALDA, The 603 and Terminology (pics)

Shows the manifold line on the bottom also.

__________________

Gone to the dark side

- Jeff