vacuum advance idle issue?

RustyRatRod said

If the engine rattles, the timing is too far advanced. Make sure your vacuum advance is attached to ported vacuum. That means at idle, there is no vacuum applied. As the engine RPM increases, vacuum is applied. There should be a vacuum port ABOVE the throttle plate that is ported.

To set the timing, disconnect the vacuum advance from the distributor and plug the line. Get a timing light and set the timing to 10* before top dead center. Reconnect the line and drive it. Readjust as needed. What I would do is advance it until it rattles on a slight incline going slow lugging in high gear, then retard the timing until it stops and lock it down right there. Recheck it with the timing light and record where it is so at the next tune up you will know where it likes to be set.

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I found the port its supposed to go to on the carb. Thanks for the idiot check, unfourtunately routinely neccesary for me. idiot savant souds better than idiot alone...

But it ran far worse when I advanced it, clean up to the stop...took out the distributor and advanced a tooth sounded like gremlins hammering inside my bottem end. Did this two more times in either direction of origonal position but put it back how it was origonally. Pulled #1 plug and set the timing with actual TDC. Warms up and idles good, pull the stop off the port, no change-then connect vac hose and even in park it drops and sputters and jumps around like its not fireing on all 6 and will die every time unless you IMMEDEATELY pull the rpm up 3000 4000(but runs smooth dosent miss and sounds like a 10,000mi engine. The only way iv got it to stay alive is by setting the fast idle screw undrivably fast. Like a 35hundred neutral drop comming out of park. Even then it has to idle way to high to be good for the 904 sloshbox? Id expext it to get HOT if you rode the break all around town or had to stop at a light spinning 3k.