i see the guide plates say isky, I would say they need to be adjusted as you suspect. Are they all showing that off centered ness or just one or two? I have seen the adjustables welded in place after set up to avoid movement and ease reassembly if they are ever taken out from under the rocker studs.
I have used speed master plates on speed masters wo issue, have not compared to edelbrock. But i have a set of each i may be able to compare tomorrow morning if it helps
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1968 firebird cameo white on red 400 4 speed
1969 carousel red firebird 455, richmond 5 speed
1964 gto pump gas, 505 IA2 EHeads, EFI, 92 mm turbo ice cream getter in process now....
1970 lemans hardtop, gto clone Atoll Blue
1972 Maverick powered by 2004 gto ls1 and t56 6 speed, 8.8, fox strut front end, wifes car
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