318 Idle issues

There are definitely problem carburetors for sure. The edlebrock 750 is a know problem carb. The street avenger may be one of those, I’m not sure. But it’s worth (because he has it) putting a little time into actually tuning it (beyond jetting and needles) to see if it could work for him.
I ordered a rebuild kit for this last night. I am going to work on that this weekend. Hopefully that will help things out. It will be interesting to see what I find. I also ordered the Holley rebuilder book. Once I have this done and get it back running I plan on checking the crank case for vacuum.