Late in the day today, I swapped out the secondaries from 80 to 75's. I thought I noticed a little preignition when testing the secondaries tonight. A/F gauge seemed to look okay the second time, but I'll leave it for now and test it a little longer before changing.
On another note, the moroso clear float bowl plugs. When I went to change out the rear jets, I noticed part of the clear lens sitting in the intake. It was from the primary bowl. Since they are just hand tight, I can only assume it failed. That would not be good, as the seal was gone, just the threaded insert remained. It could have leaked fuel, so I'll send them back for a replacement, and leave the brass ones in place, unless I am testing.
It does look like the fuel economy (if you can call it that with an 8 liter engine) has improved dramatically. I am at a 1/2 tank for the long weekend. Usually, the whole tank would be gone by now, so I will only know the true reading when I fill up the tank a little later.