About 3 weeks ago, I purchased a replacement RS hose kit from Heartbeat City Camaro out of Detroit for my '69. I am posting this note during my lunch break at work and don't have the package who see who manufactured the hose kit at the moment.
All told, the hoses in my kit came with extra length. I test matched them to the lengths of my older hoses to make sure they were long enough, but I made sure that there was some extra slack length before I trimmed them to the usable length. My experience has been that the hoses tend to deteriorate, split, and crack where they get pushed (stretched) over the fittings. The extra slack allows you to trim an 1/2" - 1" off the hose the reconnect it if needed in the future.