I must lower my existing 3 blade 50A 125/250v Leviton receptacle 1ft so my new range fits tight to wall. Existing wiring is 2 #6 (black, white) and 1 bare cu (#10?). The new range has wiring options for 3 wire. To move the receptacle, I bought 2' of 6-2 NM-B w/g, made up connections in old box, and terminated new wire to old "reused" receptacle in new box (now 1' lower). After reading many posts, I've not plugged 3wire range plug in, and I haven't yet turned breaker back on! Sort of concerned about bare neutral/ground. Am I ok?