Stock or aftermarket heads? "B" block? or "RB"?
If you got the money, the TTI headers are really nice, and they have headers to fit the different aftermarket cylinder heads, but they cost in the $600-$700 range.
For stock heads the Hooker Super Comp 1-3/4" headers seem to fit good. I'm not sure about the 1-7/8" size? I am currently using the 2" primary size 3-peice headers and they are a very tight fit.

Had some old BlackJack AK5000's on my 383, but returned them because they were not completly welded so they leaked really bad.