Thank you everyone for the guidance, put an indicator on the #6 rocker, and compared to others; dead nutz the same so I'm happy about that.
Went over all and set preload as Hughes recommended for their rockers, using the 90* method and doing one intake and one exhaust as they have in their instructions.
I must say all the others were Very close to what I reset them to.
And...some lifters were very solid, some, not so much
Maybe it was one mis-adjusted rocker at that and just a coincidence on #6.
Start-up tomorrow after valve covers seal up.
Thank you everyone!!
Joe