471 Big Block high rpm problems

I also forgot to mention that magnetic pickup is new in the distributor as well as cap and rotor...
I tried to reverse wires on the distributor and car started running badly, did not test high rpms and switched it back the way it was.

My vacuum value is shown in the photo, it is how much I am pulling in Park position. Wile in gear at 850 rpms its showing between 5 and 6. I also checked my power valve and it is 5,5.
It means that I should have like 2,5 valve right? Would it really be the cause of my problem?
I am not sure if I understand how this valve really works...

I also realized today while testing that I did not press the pedal all the way to the floor, I did it today and it was a bit better but it would still brake up ocassionaly.

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