I have a 79 Berlinetta with a 305 that has just been overhauled. I have about 1500 miles on it. Idle is about 650. When I come to a stop sign, my new Edelbrock 1406 will drop down under 500 RPM and then usually come back up to the 650. The car starts right up cold. When it is hot, I have to floor it to get it to start and I do have to crank for 5 or 6 seconds, and then it will not run good for a minute or two (meaning that it does not want to stay running when I put it in gear to move from a parking place...) I have checked the floats, and they were close to what they are supposed to be. We did put on a new fuel pump with the overhaul. I will turn up the RPMs a bit, but any other advice would be helpful. A 350 would be really cool, but this engine had never been out of the car, it has I believe a 2.41 rear end, so, leave the engine the same, it is not a speed demon by any means, but at 1900 RPM we are at 60 mph. I just replaced the front window, first time since 1979. Thanks, any help is appreciated!
Tim

 

That does sound like a carb problem to me, but check the timing too.. for the stop sign idle problem try plugging the vacuum booster to see if it is giving your idle fits with a leak... random thoughts

 

1) Sounds like your choke may not be set right. It might not be opening up all the way when hot, or it's staying open for too long after a short cool down.
2) Your curb idle is set too low, speed it up to the 800 rpm range and see how it does.
3) Is your engine temp running hot, and is the exhaust crossover in the intake manifold still open or was it blocked off?
The carb could be getting too much heat at the base, making the gas perk out of it when it sits hot after shutdown.
4) A vacuum leak will speed up your idle, so I doubt it's that.
5) What kind of a fuel pump do you have?

 

First off, thanks for the replys. I do have an electric choke, and yes, I may need to adjust it. I will adjust the idle up. The exhaust crossover I will check. Seems to me I opened it up to stay open, but it may be a problem. I am not using it. Yes, my engine seems to run a bit warm. I had the A/C on the other day and it was running hot, just shut off the A/C and everything went right back to normal. I am running a stock AC pump.
Thanks!!
Tim

 

I forgot something, I replaced the foam in my front seats. There was a build sheet under the drivers foam and over the wires/springs. This would have been there since new. Is this standard?

 

The exhaust crossover is a center port in the intake manifold, that mates up to the heads, which heats up the base of the carb to help with cold weather driving. You'd need to have the intake manifold off, or remember what was done to know how it is now. From the factory it was left open, but it's normal practice for a nice weather only car to block both sides off with a plate on the intake gaskets.
Nice find on the build sheet, and no, it's not "standard" to have one. That was the guide that was followed when the car was being assembled. To get rid of it at the end of the assembly line, a worker either stuffed it somewhere inside the car, or threw it out. There was no rule that it had to go with the car, so getting one was a crap shoot.