[mysticmissle]

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