Street/Strip fuel hose suggestions....
Typically -10 hose is about .560" I. D., and the reason they say to go so big is because most of the fittings are a bit restrictive, and many have an I.D. quite a bit smaller (somewhere around .480" on most -10 fittings).
The -10 does indeed mean 5/8". But it's referencing 5/8" O. D. hard tubing, which is what this stuff was designed to be compatible to.
AN Fittings & Hose Sizes - Pegasus