I wouldn't either; however, the guy I got it from (a Mopar buddy), installed a brand new fuel line back in the late 90s when he was working on the car and it's never had fuel run through it!.
It seems the general concensus is to go with the 3/8ths line. I should be able to pick up a new 3/8th line while at the Nationals. I'm thinking that down the road I will see about converting it over to a FAST, Atomic, etc style EFI. The new 5/16ths could be used as a return line if I go with a return system.
i agree.... yea i know its really overkill but is it really much more going to 1/2"? you are replacing it all anyway, and this way if you ever decide to go nuts you have the fuel system to support it...