E motor timing anomoly

Recently got another Camaro, 91 RS. I've been going through all of the maintenance and tune up steps after curing the overheating - BTW, mine had about twenty pounds of leaves, dirt, SAND, and grass wedged between the A/C fins & radiator - no idea on how that much got in there. Anyways, I got around to inspecting ignition timing, and what should be simple is vague at best. The underhood gives 0 deg btdc at idle. No idle figure is mentioned there or in the manual. It does say idle is computer controlled. While jumping the ALDL A-B, w/ wire disconnected at dist, is just off scale advanced. If I set it at 0, it's definitely wrong. Anyone have a clue on how to make the procedure work as expected?

lol just wanted to say i love your 67...i would die for one of those...

It should still say idle speed, even tho is controlled,. Off the top of my head I want to say 550 at operating temp. You don't have to jump the ALDL, just sidconnect the single TAN wire on the passenger side firewall and go from there.

You would think the idle speed would be listed, but it's not. I could get a pic of the decals, but AF pic posting didn't work last I checked.The tach reads just shy of 1000. Got the other issue regarding the advance, but the idle speed is still a mystery. I'll check the tach with my Sunn, cause I hear the dash model isn't accurate. Thanks all!

In dash one is junk. I usually end up doing the final setting by ear personally.