Quote Originally Posted by C9x
Which . . . still makes use of the Heims and rod.


Set up a bracket with bell crank or a simple swinging arm near the front of the engine (or at least in front of the carb throttle arm), run the throttle cable to it.

That way, the firewall seal is easy and you have a smooth, long turn to the bellcrank/arm.
Too much complication ....and there really are no spare manifold bosses with tapped hole left ahead of the carb. What I will be doing is making up something like your "weather guard' using a couple of.25 thick X 2" dia. aluminum round stock, a piece of .125 neoprene outside and possibly another inside. The rise and fall will probably be minimal (need to 'calculate it' ) so vertical splits in the neoprene should do me