Hi Jim!
sorry for the delay!! Alot of things beside my car happend over the last view days.. so well, here we go....
i think i found the problem.
After a few more fails & try outs, starting with the Harmonic Balancer "Slip" check, or maybe false "Timing Marks" on the Balancer or the aftermarket "Timing Tab", cause i have a 1964 Engine and use a 65` Waterpump, so it needs 1965 Timing Tab.
Side Note: 1965 Waterpump has the inlet on the "Right" side, The 1964` Waterpump on the Left. So i had to get a other "timing tab" back in 2020, cause the 1964 would be underneath the Waterinlet if you choose to go with a 1965 & upwards Waterpump.
The Balancer has to be one that has the TDC matching to this Waterpump situation & Timing Tab to read the correct timing..
Anyway, hours later.. all "Could be`s" were good.
then i took the carb off again and inspected only the Idle circuit and cleand it "again"... i took some airpressure, breakcleaner & a mircro-brush..
got it back on the car again and there was stiiiilll the same problem..
So i took my NEW quick "CO Tester" to see in what "CO Range" i am with all of these problems... it showed a CO of 6.8 !! to "Rich" .. i tried the idle Mixtures Screw again, but no big changes... soo i got a bit Angry and took a Spray Can of Breakcleaner and sprayed the Intake allover, aswell on Bolts & Vac Links i didn`t expected it could be a problem..
THEN!! there was a reaction, so strong the engine turn off..
THE REAR MANIFOLD BOLTS (see Pictures), underneath the Iginition Coil and opposite too..
They were tight.. approx 25 LBS/ft but they Sucked AIR thru the Washers down that shaft to where ever... So i took one by one bolt out and filled the hole with Heat-Resistant Engine RTV Silicone (i dont like it that much, but.. hm) . to prevent and other leaks it creamed the edges at manifold / heads too .. (see picture) ..
Next Day, i startet the car.. checked with my "CO Tester" adjusted IMS (Idle mix Screws) and Idle Speed screw down to 700 Rpm (no Vacuum Adv. Connected) and got my 3.5 CO adjustement on both sides..
I drove without Vac. Advance on 12Degree @ 800 RPM / 27 Degree @ 1600 RPM / 35.7 Deg. @ 2700RPM / 36 Deg. @ 3500 and 2x MSD Silver Light Springs (points distributor) and it was okay to drive... no pinging / knocking..
More timing test will come this week.
I`m soooo sorrry taking your time, driving you insane on something so simple, but i was so shure that this couldn`t be a Vacuum leak, cause after changing to the Edelbrock 2711 (350 Olds) Performer Manifold on May 21st this Year i had a CO of 4 and the Mixture Screws have been adjustable.