What fuel hose to buy?

I have several 20+ year old cars that I'm working on. Much of the old rubber is showing its age. I just got some fuel hose and now I realize that it's probably for carbureted vehicle applications rather than higher pressure fuel injection use. What do I need to look for? What are the considerations? What's a good way to join it with hard-lines?

Here's what I got. The manufacturer says its rated to 50 psi with a burst of 250 psi. Probably going on my lawn tractor and old Jet skis instead of the cars:

30r6 and 30r7 are both rated to 50 'continuous' or whatever that means. I buy fuel hose in 25' rolls on amazon. The 'fuel injection hose' is 30r9 and cheapest roll on amazon right now is ~$60. That's not crazy per-foot, but I decided to cheap out this time and buy what you got and see what happens. The highest any of my fuel systems go is ~80psi on my boost-referenced turbo cars, and i'm constantly under the hood on those things so im not exactly worried about a problem sneaking up on me. 

If i were going to put it in a difficult to access place that i didn't want to see again for several years (there are probably some places like that in a Boxster, for example), I'd buy the 'right thing'.  

Amazon also has a bunch of 7' lengths for ~$15, so it's not like you're stuck buying a $60 roll if you don't need it. 

Gates Barricade lineup seems to be the go to fuel hose these days.

There's a couple variants which feature some extremely low permeation rates and confirm to SAW J30R14T2.