Missing power 440?

Hi ! I got my car running with new 60303 Lunati voodoo cam last week. During the week I have been tuning carb and finding the right jets (Quickfuel 850 mechanical double pumper). At the moment it is working best with 75 primary mainjet and 84 secondary main jet. Little bit too rich at top end. I have to admit that I am not happy with the engine at all :(. Performance is still poor. I even took my car to local mopar performance builder and he checked it also. He said that it is working good but it is not pulling strong. He said also that now parts in my engine are ok and it should perform well!
I have been adjusting ignition and at the moment it is 17 initial and total 37. Vacuum not connected, because of detonation problem.
I am thinking that maybe the reason would be my ignition (PROCOMP 7000 series)
because engine has a flatspot around 3000-4000rpm. ( I have tried to change accelerator pump jets but doesnt help) Biggest effect to reduce this flatspot has been main jets tuning

Before the lunati cam change, I had 284/284 MP cam and car was faster with it

Before I lose my mind and order stroker kit or supercharger, it would be nice to find reason for this :BangHead:. This local engine builder was thinking that maybe porting in my 906 heads are somehow wrong

Summer is short here in Finland, when trying to get the car to work ;)