Throttle Pressure Link Problem
The linkage is probably for a 2 barrel .. and not modified properly.
There's 3 ways to make it work,..
-Mickey Mouse but functional..-- Install a nut and bolt as a "stop" in the slide part,, and adjust it to push the rod all the way back,, making sure when your done,, that the throttle will return to closed.
-Lengthen the rod-, by welding a section in..
-Get the proper rod...
hope it helps