Want to test and use a beautiful 1950s range/oven in my kitchen and need to install correct receptacle My 1978 era house has built in wall oven and cooktop. Panel has 50A breaker for range and 40A breaker for wall oven. The cooktop (replaced probably 10 years ago) with flex-conduit connects to a box mounted to back wall underneath and there is a black wire, a red wire and a bare copper wire. House wiring has the two wires plus a gray metal stranded thick wire. Connections are big wirenuts. I purchased a 3-slot 50A range receptacle which matches the cord plug on my early 1950s range/oven (10.9 kw) I'd like to disconnect the cooktop and wire in the recptacle to plug in test the vintage range/oven. My plan is to eventually reconfigure my kitchen cabinets so as to use the vintage range/oven instead of the built in cook top Can this be done? and which wires connect to which terminal screws in my three prong receptacle?.....many thanks!!!