I always try to run the battery cable and fuel lines inside the frame rails for protection from things such as jacks, jack stands , loading/unloading damage and the possibility of off track/road excursions!!!!!! For battery cable, use a length of welding cable as it is made very abrasive resistant and is the best cable you can buy. On fuel lines I use a .035 ss tube and AN flares/fittings ---the braided lines I don't like as like everyone has said are abrasive, but they also cause or are contributors to a lot of electrical malfuntions--where poor grounds cause feed back issues thru the braid....with all the high amp electric stuff as ignitions, fuel pumps and water pumps/fans---most are not grounded good and the braid then carries a lot of current in back feeds

\Also for racing the cables/lines need to be protected along the clutch/drive line areas and the frame is as good as it can get