Something doesn't add up. I was sure they are were all 4 barrel. There was no factory offering of a 2 barrel on a 66 327 as far as I've ever seen or read. Are you sure you have the correct year of engine and carb combination?
The one exception I'm thinking may be in a 1/2 ton but I thought even those were 4 barrel.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars
There is a place in Victoria called Tube and Line Inc. and they handle all the fuel lines and transmission cooler lines. Great fit and very reasonably priced. Don't have the link but they will google up easily.