1=USA, G=General Motors, T= ?? should be a 1 or C, C=4001-5000 pounds GVW, W=El Camino, 80= 2dr. pick up , H= 305 V8 - 4 barrel carb, 9= Check didgit, D= 1983, B= Baltimore plant , R=Arlington plant , 500592= production # . Is that B really an R ? or visa versa ? I think each plant has a # like starting with 100001 would be 1st car made that year . Since yours is 500592 yours was the 592 made that year at plant 5 .So no is my answer . you need to check your #s again . This is my guess but not 100% sure . If you let me know ahead of time what year your car is it would be a lot easier . If you post your cowl tag I can give you more info .