So last fall (2015) I developed a bog above 3500 rpms. As if I needed another issue. AFR gauge showed the car was going full rich at these times. So I started trying to tune ping out and the bog. IT was an Edelbrock AVS. I changed to richer metering rods, lighter springs...then heavier springs. Still pinged. changed spring tension on secondary air flap. I went from 116 jets to 107 jets for secondaries and it still bogged. I was at wits end. I called a friend who might help. As in the other thread, '557 is terrible' he borrowed me his 850 mighty demon which based on his setup should work the way it was. Fired right up after install and drove so much better. The ping and bog was gone it seemed on 10 min drive. However, I discovered a stumble off idle.

Yesterday, I got it all squared away. OMG I hope. I drove an hour in 55 degree weather (sea level). Ping is barely there and stumble off idle is gone. Car feels much better, quick and responsive. It will spin drag radials on street from a stop in drive (it wasn't with edlebrock or mighty demon last week). Also, the run on (dieseling) is gone even when really hot. Car also seemed to run about 5 degrees cooler.

Changes made to the
timing confirmed at 19/34 backed off from about 22/37
4 corner idle screws out another quarter turn to 1.5 turns total (vacuum 5 at idle)
turn idle screw out (idle at about 750 800 now) was about 1000 when warm
5.5 PV
jets 82 and 92
squirters 31
spark plugs are stock heat range AC delco 43s

to be continued...

I hope this helps someone with a similar setup in the future.