I'm doing an intake gasket on my RMW. While getting ready to pull the manifold I found out how terribly dry, cracked and brittle many of my rubber vacuum lines were. I have no desire to monkey around with fittings, measurements and bulk hose to replace everything. I found an eBay seller who sells silicone hose kits that will do all the vac lines plus some other stuff for $55 shipped. There are a few threads over on the big Impala forum about them and the feedback generally seems to be positive.
I searched on here and only found one thread about replacing vac lines so thought someone might be interested in this as an option at some point.