If it was installed in 2000 it is probably a 4 wire circuit, assuming it was done with a permit. You must use a 4 wire receptacle. If the 1996 or newer NEC was in effect in your area when the circuit was installed and it had a 3 wire circuit for a 120/240 volt load it was not up to code when installed so it must be replaced. Most ovens require 120 and 240 volts, so you need 2 hots, an insulated neutral, and a grounding wire. Is it a range unit or just an oven, if its just the oven some are direct wired. A 4 wire feed is needed for a 120/240 volt load regardless of if cord and plug connected or direct wired. As you know, the amperage draw must be considered, and compared to the wire size and breaker size.