OP - Is that really a 4 barrel carb? The pics from the side show a base that doesn't seem large enough front to back... Never mind it's just the shadow of the weird throttle clamp arrangement.
NO!!! I think that the arm that you attached to the carb is actually the one that goes from the bracket to the bell crank at the transmission. The correct arm should have a long slot where it connects to the carb. These photos are from my 1970 Dart 318 with an Edelbrock Performer manifold and an Edelbrock AFB. I think you can see the rod that you have connected to the carb attached to the firewall end of the throttle bracket in the second photo. The throttle bracket shown is the 340/360 bracket and attaches under the last 2 intake bolts on the right in the pictures
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