if you would like to shorten your fuel lines that is ok you dont have to worry about heating issues with the fuel line touching the cooling head or the engine block the fuel line will hold up to the heat (if you engine gets that hot you have a problem) to keep the engine from stalling "when" you flip over just tie a loose square knot in the return fuel line ie the one that goes from the tank to the exhaust.
also by shortening the fuel line your engine may be easier to start / tune because the fuel has a shorter distance to travel from the tank and you dont have to worry about your engine over heating just because you shortened the fuel line ...hope this helps