Fuel line / clamps?

It appears that due to age and non-use I need to replace all the fuel line on this ole beast before she hits the water. It appears to be all 5/16 line withe the exception of the lines from the block to the pumps which appears to be 1/4. Does this sound right? Also do you experts suggest any type of clamp over another? This thing currently has a mix of no clamps, wire ties and ss worm clamps. I was thinking the OEM style automotive spring clamps as I can get them in tight spaces and maybe not have to remove all the carbs but I would like your input... Is SAE type line sufficient or should I use marine grade?

Thanks!