You can have some of these larger rivets if you want. I used them to join the visor to the cap. They’re solid aluminum; I used an air hammer and bucking bar to install.
My carb base is like this too on my 10/‘79.
The smaller line goes to the lower choke opener on the carb
The larger line goes to the Y port on the VCV valve mounted on the driver fender
Maybe your setup should be similar? I’m not familiar with difference in the emissions across the years.
Check this out, might help.
Post in thread 'Ohio Red 1978 FJ40'
Ohio Red 1978 FJ40 - https://forum.ih8mud.com/threads/ohio-red-1978-fj40.1245224/post-13863237
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