What is this, what does it do & why do I need it?
 

78SC, A/C and heater removed.
Have removed CIS injection system and preparing to install Bitz EFI using 3.2 intake manifold.
When the mystery part was removed, it had 1 vacuum line attached, but not connected to anything, the larger 2 connections were not connected to anything. The internal parts were rattling around!
Thanks in advance.
Will I need it with the EFI?
http://forums.pelicanparts.com/uploa...1321740275.jpg

charcoal canister, big debate whether its needed or not. do a search.

Many thanks - judging by the number of result I got when I searched charcoal canister I'm glad to see I'm not the only one who had no idea what it was :o)