I run 93 pump gas with a ZX distributor and full advace on my '72 2.4. If I remember right it's 17 and 34 at 3,000 rpm.

Is your advace hose hooked to the front carb? 

Yes

I think the factory setting for a 240 is about 5 Degrees. But it has been a LONG time since I was stock 2.4 liter.  My initial timing is about 12 degrees now with a max of 36, but I am running an MSD dizzy with an all mechanical advance due to triples.   You are blessed with a factory stock car so lets get the settings back to stock.  I think you should be at 5 degreed BDTC with no the Vac Advance plugged.  Correct me guys on this if I am misspeaking.    Lets get our friend back on track. If you are running 20 degrees on your stock car, it may be aiding your high idle. 

I haven’t put a timing light on it yet but I seriously doubt it has 20 initial.

Thanks Zed!

That's right!  Thanks for posting that Zed!!! See my memory is getting horrible. 

3 hours ago, Zedyone_kenobi said:

 See my memory is getting horrible. 

Vitamin B12.

4 hours ago, Zedyone_kenobi said:

See my memory is getting horrible. 

I have to use my memory to get to the bathroom at night, I can't hardly see. 

Only one trip per nite!! I’m at at least two!! Practice makes Perfect…😂😂

Small world.  I live by columbia city. I used to work in Upland/GasCity.

I have a low mile factory '71, a tore down restoration project '70 and a ~'71 that had it's vin was messed with in an earlier life (but she is a little rough).  If you need to see anything, let me know. 🙂