what type of fuel lines ?
3/8 line should do what you need now and have room to grow. It won't take much before you start needing bigger fuel lines so you need to make a realistic assessment of where you think you will end up.
I wouldn't run push lock hose the length of the car.
I looked at Nylon also but chose not to go with it.
If I ever do another conversion I will probably just do the 3/8" NiCopp and flare the GM push connects on the ends, and just use the Corvette OEM braided push lock lines between the engine and fuel tank/filter.
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