67 heat and air control swap?
 

Currently the heat and A/C controls on my car are vacuum operated. Is there a way to convert to standard cables. The junction block that supplies vacuum to the different hoses is old and could create a vacuum leak.

It would be easier to get someone to supply a new junction block, or possibly make a mold for one and reproduce them. However I recollect you can do away with the junction block and attach the hoses directly to their destination. The junction block just makes it fool proof