i'd pinstripe the lines, lay oversized vinyl and cut on the car. (on the tape of course) then pull the edge of the tape out from under the vinyl and squeegee down the edges. this way, you'll be able to get straight stripes. if you pre-cut the stripes, the curves in the hood and roof will casue them to bend when you apply them. we did some on a rousch mustang that were laser straight, ran the pinstripe along a laser. just make sure you cut them straight.