All rubber is the way to go. I've never had any issues after replacing mine with rubber and it gives me some peace of mind knowing those old brittle lines won't be springing any leaks.

 

Got a roll of 5/16" rubber fuel line and rerouted it since it doesn't fit under the cowl. I brought it up and followed the big hose and ziptied them together

All set guys thanks!

The one that goes under the throttle body looks like its been patched before. Some of it is fuel line like what I bought and was the plastic tubing in the middle