While above statements may be correct as far as fit goes prior to 1984 however, I am almost positive the header panel line on a 1983 will not line up with the 1984-1987 style hood. The hood will fit but the body line as flows to the front will not line up even with the 1983 and older header panel.
I may be wrong as I am going by memory. If the body line is not an issue then you may be all rite.