If you're going to run the lines up front and back, you need to use AN-10 or AN-12, which are 5/8" and 3/4" I.D. respectively.
AN-8 (1/2" I.D.) is totally adequate if all the oil lines are kept within the vicinity of the engine bay.
I've had a 26mm pump with Berg pressure relief cover, full flow, thermostat, filter, cooler and 1.5 qt. slim sump. It worked GREAT and cooled effectively. I used AN-8.
I now have a dry sump and use AN-8 on all pressure lines. I use AN-10 on all the scavenge lines.