[ridelikehell]

ConCobra:
-Haven't checked any vacuum readings yet so I don't know for sure.
-Primary throttle plates are not drilled.
-I have no clue what the opening number is on the power valves.

Excalibur:
-The carb is a Holley 600 DP with mechanical secondaries.
-I was having some idle problems a little while back (too lean)...Actually, I had the car set to 12* and it was running fine, and I had to pull my distributor, and this problem has really only come up since then...
Could possible be a vacuum leak but I have no idea where from?...The only vacuum line I'm running is to the brake booster...
I get the car back at the end of this week (in for paint right now) so I'll do some more extensive checks then...

As far as leaving it at 18*...I'm fine with that as long as it's not going to cause any problems...Rob's got me a little concerned about the total advance now...I think I'm gonna have to set the stops in the distributor...

Thanks so far for all the help!