Im rebuilding my carbs . Was wondering if its necessary to check pop off pressure.

This thing was running so-so with a set of 40 mm carbs but i was loosing 100-200 rpms off the top end and was running way to rich so i decided to go back to the original 38s .

Installed a fresh set of rebuild kits and got a accelerator pump parts from

Going to be redoing the fuel lines and pulse lines . Since the last time it was done was 5-6 years ago and i live in an ethanol blended state .

Rubber fuel line the best way to go ?