Vacuum Advance

[Todd Tomason <jayscore@xxxxxxxxxxxxx>]

I dug out my trusty vacuum pump and I've been playing with the vacuum advance 
on my 83 Spirit with the 258.  I have a rebuilt distributor that I bought 
from Jock some time back, so I tried it on there first.  I don't see any 
advance until the vacuum is at about 5 in.  It seems to be completely 
advanced at 15 in.  

The one in the Spirit is quite different.  It starts to advance at 2 or 3 in., 
and is completely advanced at about 7 in.  

Anybody know what normal should be?  I'm thinking the one in the car probably 
has a weak spring.  I'm also starting to suspect that the mechanical advance 
has a broken or weak spring too.  I'm going to try swapping them this weekend 
and see if the rebuilt distributor runs any better.

Todd