One thing I have noticed is that my carb throttle plate was not always closing fully at idle because of insufficient spring tension in the accelerator linkage spring. The spring attaching tang was adjusted towards the carb side, so I backed out the nut towards the firewall side to increase the spring tension. It is now only about 0.5" from the firewall end of the threaded rod. Spring tension is better, but still not very far extended. But now I notice that I have taken away travel in the accelerator floor treadle. It is half way to the floor at idle! Is my spring too long? It measures 1.5" of coils and 3.3" end to end.
Here is a picture of the spring and linkage attachment. You can see the spring is not very extended.
I just had a thought. Is there any reason that I couldn't move the linage attachment nut to the carb side of the rod and move the spring tang to the firewall side of the rod? This would improve the range of movement of the accelerator treadle while keeping good tension on the return spring....
Two things you can do. You have the civilian-model tab on the carb stud. You could bend the rod spring tab toward the firewall and/or secure the shorter military spring. I have a few in stock. I could just toss one in the kit.