The first CIS was on the 73.5 911, which didn't have any of the internal air box cold start plumbing, nor did it have any of the external cold start air plumbing. There was no air connection behind the Cold start valve until 1976. These things were added as time went on as improvements, but are not required for cold start. The fuel mist from the CSV is conveyed to the cylinders along with the air from the throttle housing.

What is the best way to plug the CSV hose connection after removing these hoses and such?

The hand throttle has worked out great from the beginning. Has been around 35-40 degree the last few mornings, pull throttle lever up, engine fires right up and idles at around 1500-2000, (you can adjust the stop screw to your preference) a block or two down the road, i push it down. Cleaned up the engine compartment, no more vacuum leak concerns from that area, and is is pretty good cruise control device on flat road.http://forums.pelicanparts.com/uploa...1256183986.jpg

Any pictures of the engine from the fly wheel side? :D

I don't know know about the BEST way, maybe others will answer, and you can decide. I'm sure there are any number of ways to do this. But A way to do this would be to find a short length of hose, the same diameter as what was there, slide it over the phenolic housing of the CSV, and plug the open end with something from your scrap materials box (everyone has one of those, right?). Pick something that ideally is not affected by gas and oil. And secure both connections with hose clamps. Just make it air tight; you don't need a vacuum leak.

(An observation is that, for accessibility, you may want to save this job for when the engine is out of the car.)

As for the other end of the plumbing connection, the one on the backside of the rubber boot connecting the airflow sensor and the throttle body, another plug of the material of your choice.

thats how i did mine Jim, I was afraid to use any kind of epoxy or sealer, as there is a lot of vacuum on that port.

I have 3 of The phenolic housings of the CSV that jim is talking about from random years and all of them are blocked off internally. I don't know when or if they ever did get opened up. So check yours before you plan to replace or plug it.
http://forums.pelicanparts.com/uploa...1256217872.jpg

As far as plugging the holes in the boot for the fuel distributer to throttle body connection find one from a 74/75 you wont have to plug any holes. I have an etra one I could sell you if you want it pm me.

http://forums.pelicanparts.com/uploa...1256218085.jpg

This is what the back should look like with all of the crap gone.

http://forums.pelicanparts.com/uploa...1256218165.jpg
http://forums.pelicanparts.com/uploa...1256218180.jpg