I know some people here get irritated by the same questions being asked so I did a search first looking for the answer to my question. I did not find exactly what I was looking for so here goes.

What is the proper idle speed for my chevelle with a 350, with a pretty hefty cam (not sure exactly), and a 750 double pumper?

I would like to know where it sould be in park and where it should be when I put it in gear?

Thanks again for the help.

800/600 rpm

grape,
There really is no "proper" idle speed for a modified engine. Every engine is different, and will like a different idle speed. I guess a good rule of thumb is as low an idle speed as you can get and not have it load up or stall out when in gear with an automatic transmission. Most engines should be able to idle in the 600-800 rpm range unless something is really wrong with the "tune up", meaning carb adjustment and ignition curve. Whatever your combination "likes" is correct.

when you say 600-800 is that when it is in gear or park?
Thanks again.

Means 800 in park, 600 in gear.

But as BillK said basically the lowest you can go to have it idle well in park and not stall out in gear.

The lower it idles the meaner the exhaust will sound at the lights ;)