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Okay - turns out I have an oil issue . Oil is getting into to cylinders 4-6 , progressively worse from 4 on . The oil is diluting the charge and causing a misfire - especially in 6. 4&5 seems to be able to burn it off . 
I removed the intake to check for vacuum leaks to find an oily film in the runners 4-6 . Runners of intake and head both had oil film. 
First suspect was/is the valve stem seals. I tried a different kind on this build vs my L24. Visually they looked fine . They took a lot of persuasion to install and thought maybe I used too much . Last seals were a Ford seals , which were difficult because they are finicky as hell to install. 
Actually replaced #6 seal while head was in motor - ran motor and still have same results . Not being able to pin this down I decided to pull the head and look at the guides and anything else . Getting good at this now I guess - 1 hour later the head was on the beach . But no smoking gun found . I ordered more seals anyway.

Decision time now . Do I go deeper and pull pistons or throw all new valve seals on and reinstall head and keep fingers crossed ? I was getting ready to leave town and really wanted an answer so I dropped the pan and pulled 6.

Still no smoking gun - as far as my experience(novice) eyes can tell. Got on the phone to my machinist - but didn’t hear back yet. My inspection was very quick , so when I’m back in town I will scrutinize closer . 
Just trying to determine source of oil . I was expecting to see a collapsed expansion ring or another failed ring . There was marks on the bores on the thrust side that were fairly significant visually  , but nothing you could feel.

I have an extra assembled f54 flat top short block sitting there untouched by amateur hands  with 110k miles with perfect wear in the bores . Also pulled a couple of bearings and everything looked spot on. Depending on what I find or not find it might be the next plan. With the head off it makes assembly decision equal. 

Though this is frustrating , the hobby of engine building will have these outcomes I guess . Not being a stock engine makes this more of a challenge . Missing the L24 right about now because I enjoy driving my car - a lot ! I was hoping for more engine swap and tune - not engine swap and troubleshoot . Hopefully I learn from my mistakes 

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7 hours ago, Leon said:

I'm not familiar with the EFI stuff but where is the PCV valve located on that manifold? Are there any other possible oil paths into the intake that you haven't explored, outside of the stem seal and piston rings?

PCV is basically located on the bottom center of the n42. 

https://images.app.goo.gl/s7MedL1SofYUqDMXA

 

It actually looks biased towards front . I run through oil catch can to the PCV . I also think the #4 would get most of the junk being close to the PCV .

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Can you post more pictures?  wide view of all the parts removed, close up of others.  Much easier to view something, then trying to diagnose by what someone says.  Not trying to be an ass, just was frustrating when customers would only state what they think was wrong, but would never ride along with us technicians to better express what they heard or felt.

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