Good Call robot - also note that "USA" was only used in 1983 - so I'm thinking it was a late 1983 build for a truck - As to the parts house shuffle, tell them it's a 1983 Chevy C20 with a 4 barrel carb and that should cover 90% of the soft parts like plugs, rotor, distributor cap, etc...

Glad she runs well - what is the vehicle that it currently resides in?