[kitcarbp]

Doug, by NOS I assume you mean new old stock , not the nitrous company, but you dont want to use old hose material compounded (manufactured) before the days of the alcohol blends the gasolines have today. Unless you know the exact rubber compound used on these old hoses as being alcohol compatible, they will degrade much "faster" with the modern gasolines, faster being a relative term here. On my ride I use modern fuel line materials compatible with alcohol by reviewing the specs from the manufacturer before I installed it. My 2 cents.