mpg on my 340

...I have a Carter Trick KIt... also jets from 95 -to 105
Rods..... so I can lean out the carb..
So the Carb is not the problem... the VC is the Issue...

Today I checked my timing.. ( after I changed the set up in the Distributor)
12 deg @ idle... 17 deg @ 1500 rpm 24 deg @ 2000
29 deg @ 2500 and 33 deg. @ 3000 rpm.. ( without the VC ! )
With VC... the timing goes up to 46 deg. @ 3000

But if I use the VC,,,I always have this klicking /pinging sound when I drive steady in the 50 to 60 mph range...
60 mph ...in my case equals 2650 rpm... more or less close to the peak of the timingcurve...with /or without VC... The engine accepts 33 deg... of timing...but the 13 deg from the VC... are too much...
The VC is connected to the Ported vacuum btw.
so perhaps I need to reduce the VC a bit more.. but then
I will end up with 42 deg.. all in..incl VC.
Greetings Juergen