I was using a car carb, finally got a marine version. Now, the old carb had a vacuum line attached coming from the distributor, the marine carb doesn't have the metal tube to attach the vacuum line to...Do I remove the (metal) tube from the old carb and install it on the "new" one? It is located less than an inch above the choke vacuum line..
The carb I have now is used, from a boat with twin 350's. My engine is an old (73) 350. Do I need that vacuum tube from the dist attached for timing purposes?
Also the old carb had a connection/tube on the lower front that had a hose that connected to the port side valve cover, new carb does not have such tube..

Thanks

Send some pics

You don't need a vacuum advance in a marine application.  Just make sure the mechanical advance gets you 20 degrees or so, forget the vacuum advance, and set the distributor so you're at 36 degrees at 3000 RPMs.

#1 is where the vacuum from the dist connected (which may not have been right) #2 is where the PVC connected. "New" carb pic to follow