Routing over to avoid heat areas. To go around the front defeats the initial purpose as it again would be close to the upper rad hose and interfere with the alternator unless I kept it high and that wouldn't look very good. Around the rear would also look odd and it would need to be really long and create a lot of surface area above the manifold to absorb heat. Can you tell I given this some thought already? lol. I think over the top is fine as it isn't frequent enough that I will need to do valve adjustments to create a big hassle. I can just take the line off the carb, flip it up to pull the cover, then reinstall and start the engine to adjust the valves. I think it'll look cleaner that way too