Nonsense, the kickdown linkage upper bellcrank mounts to the back of the cylinder head....not the firewall. Maybe I'm lucky but even after breaking many LH motor mounts, I've never had a stuck throttle because of it. It's still a cable setup so the motor would have to move quite a ways to yank the throttle cable enough to effect the carb. It's not a f'ing Chebby!
Thanks, Mark