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I have never seen the threaded part on the firewall side in all the Camaros I took apart. GM wouldn't do that IMO, as if adjusted poorly, the threaded rod would hit the firewall at WOT. I see the "V8" AIM page 104 has the cotterpin on the pass side. And I see a bend there, it looks like the accel arm is more to the drivers fender that the 2bbl carb throttle arm and the bend gets it back parallel the the CL of engine.L48 does not have a pic of that so it can be assumed same as 2bbl V8. L-65 pic on page 306 show the same 2bbl pic as a V8, but shows the small bracket for the return spring like a L48. Hmm.