The first one you pictured is from a later f-body. It will work. The second one is from and E-body or 71 up B-body . That is a one piece rod and will not work on an A-body. You need three piece linkage due to the firewall being close. The orange is 340 727 4bbl. The blue is 904 318 2bbl. Notice the rod that goes to the carb is threaded for adjustment on both. The 904 F-bodies 4bbl's are not. The rod will work but note the lever and lower rod is different. Also clocked different. I use them but you will need to get the geometry right so they stay eye to eye Carb and trans . I included a picture of a 4bbl in a Duster with a 904 using the F-body 4bbl rod and linkage. It is used with a 904 trans and lever.
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