I have the Sportsman II heads (cast iron) on my 383 that is available with the 700R. It is designed to work with 87 octane and is a complete engine with Mallory ignition, custom QJet carb etc.
I have a set of World 220 Motown heads (aluminum) with offset rockers for sale as well. $1400.00 for both heads (they are complete with Manley valves etc) delivered in the USA. They are brand new but were too big for street use on my other 383.