Distributor hold down

If the bolt is not very tight, I've had good luck using reverse cut drill bits. They'll usually back out as soon as the bit starts to bite. Just do your best to center punch it as close to center as possible. A spring loaded center punch tool works well in tight quarters. Start with a small bit and work your way up. You can get long bits in clockwise cutting but I've never looked for extended length bits in a CCW cutting design.