Edelbrock Performer or AVS carbs for 318 dual quad?

str12-340 said

I'm putting dual quads on the 318 that I just got running. If you are running an underhood in line 2X4 manifold (as opposed to a cross ram or a tunnel ram which require the carbs to open simultaneously) then Edelbrock sells a match pair of AVSII carbs that work progressively. One has an electric choke (primary carb), the other manual (that you fix open). They are made to work in tandem. Edelbrock still makes in line 2X4 manifolds for small block Chevs and Fords and the carbs don't know what they are sitting on.

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That's the carb(s) I'm looking at, but I'm probably going to run manual chokes on both (with one wired open) and 1:1 instead of progressive linkage. Does anyone know if there is any difference between the 1903/1904 and 1901/1902 versions of this carb besides a .077" main secondary jet on the 1903/1904 and a .095" main secondary on the 1901/1902? Can't tell from the manual if there's any other differences in internal channels, etc. If the only difference is in the main secondary jet, it seems like I could run 650's (1905's) and just put a smaller main jet on the secondaries.