Vacuum advance and Crane ignition question

[F Crocker <jafcjr@presys.com>]

While poking around under the hood of our '79 B with another MG
afficionando, we discovered that the vacuum advance is not hooked up. 
The car runs fine, except for fast idle (around 1400 rpm).  The car also
has a Crane ignition.  

Query:  Does the VA need to be operational with a crane ignition?

TIA
-- 
J. A. Frazer Crocker, Jr.       "I pray and incur
P. O. Box 3184                   silence...am I
Florence, OR 97439               under regard?"
541-902-0554                     R. S. Thomas
E-mail jafcjr@presys.com