I am doing that EXACT same thing for a 1964 Dart, except with Carter 1BBL's. What I have done is made a copy of the throttle rod (the rod which connects the pedal to carby) with the 90* bent end that fits into that green plastic grommet, and the welded-on L-shaped bracket which connects to the kick down rod and throttle return spring. I just made it shorter so the pedal controls the rear carby, the front carby is connected to rear carby by the linkages on the manifold. Easy to do, I just measured the difference in dimension from the where it fits into the grommet (standard) and where the rear carby grommet now is, and made the new bracket shorter by that dimension. Photo of my set up, unfortunately doesn't show the bracket. Currently making linkages to synchronise the two automatic chokes...
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