I don't know about how long Rustoleum will shine; it doesn't ever seem to dry and might not be that durable. You can get real auto paint from these guys at decent prices, and if you want to go cheap buy one of the premix PPG OMNI colors without a hardener. If you spring for the hardener you'll get better gloss retention, but make sure you use a forced air respirator.
www.autobodydepot.net They also have color charts with most of the 914 colors in them under Volkswagen for the same years at a sister site
www.autocolorlibrary.com