I have a Moroso #20190 pan on my 383 with studs and Milodon windage tray and it works fine.
http://www.edgesz28.com/edgesz28/engine.htm
See page 36 of Moroso Catalog:
http://www.moroso.com/catalog/pdf/Oi...ccessories.pdf
You will need the #20205 pan for an 86' and newer block
http://www.summitracing.com/parts/MOR-20205/
Best of luck, Ed