Its the 340. My mechanic friend says the 65 primary is too small so he had me order a pair of 68s. The linkage appears to operate fine, I can see squirts when you pull the throttle.
Verify that you have no slack in the accelerator pump linkage and adjusted as in the video. Since you are changing the jets, and will have the float bowl off, record the number on the power valve for reference. 340 CID very nice! Do you know what axle ratio is installed?