I have a 340 duster that's somewhat built big cam redone heads bored new pistons and rods. My question is I just took it out of storage and was going over a few things and I was checking base timing. I have it set at right around 14degrees btdc I noticed when I disconected my vacum advance the timing did not change. Does this mean that its not working? The car will still break the tires loose but it does feel a bit slower.