[Goat Blower]

I've never heard that you can't. It's just a matter if the old ones are still in spec, which I highly doubt. New valve guides with your expensive valves is cheap insurance to not have to pull the head again when your car starts burning oil regularly. SS valves are more durable than the stockers which is good because the exhaust valves take a real beating. Titanium is even better but also uber expensive.