Hello, 86 t/a with a 305, eddy rpm air gap intake, accel hei dizzy (non computer controlled), and a holley 650 vac secondary spread bore carb.
The carb I had before was a holley 600vac sec square bore with no choke, and the motor was idling around 2200 no matter what I did, and I couldn't find any vacuum leaks.
switched to this carb (Tis new, and not a p.o.s.) and now she's still idling at 2k. I've backed the screws all the way out, made sure all vacuum lines are plugged (or used), intake is on tight, and all new gaskets.
She still doesn't seem to want to idle down. The secondaries appear to be closing all the way, and the choke is working properly.
I'm confused as what else to do. Had a buddy throw on his eddy 600 and the idle dropped to around 1300, maybe lower, I didn't have a tach. Yet when I go to the holley, she won't idle below 2000. Power valve is new as well.

Any ideas?
Also, what causes purple flames?
I'm on straight headers, fired her up on the old holley (mostly stock motor on 85 octane) and instead of the usual blue flames, purple was mixed in for a bit.

 

what fuelpump are you using?
fuel pressure regulator?
fuel pressure before the carb?
is there enough slack in the throttle linkage?

 

I'm using a pump mounted in the engine bay for a carb with no regulator. Pressure at the carb is 6psi, and my linkage isn't hooked up just so I could eliminate that variable, as well as using a return spring.
Should also mention its a stock cam, stock tpi heads (was a tpi car) and stock internals.

 

I put my carb on a buddies truck, it ran like a champ, so its not my carb. I don't have a vacuum gauge, but I suspect an internal leak.
Pulled my intake and the gaskets were wet with oil, none on or in the intake or ports.
Heads have never been pulled, and compression test shows 180 +/- 5 on all cyls. Plugs were oily, new valve cover gaskets, pcv works fine, and I can push on the valve springs and they don't move or compress at all.
The motor has 36k original miles, so could that be just bad intake gaskets?
I just got new felpro rubber gaskets, haven't installed em yet.
Wasn't sure if it could be just gaskets or possibly valve guides. It does burn a small amount of oil.

I got new intake gaskets, plugs, carb gaskets (they weren't bad) and such.