Nasty Wendy Isn't
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Your 5/16 line is 44 years old correct? Get rid of it....
A 255lph pump would be a stock replacement. I would use a 3/8 return. For the above pumps that are over 275lph I would use AN-8 line which is close to 1/2inch
The 340 will work fine with stock GN size feed and return lines as Steve said. I found 10.80's the limit (no alchy). When I worked with TommyX he was having issues around 10.75 with alchy, 340 pump and stock lines. All is at the end limits. I would step up and play it safe
Also, it is not rated for Fuel Injection as per the note...If you run a new line, it should be metal, or covered with brading so it cannot be cut by a flying rock, or such