Hi JoeD. I am researching a similar project, (see thread on Street Sleeper). Feel free to email me at richardd@slip.net if you want to compare notes.
Any good head for a 383/400/440 will work great here. 906s seem to be the standard ut sometimes hard to find. 452s are also good and include the hardned seats for unleaded fuel.
Get a good 3 angle valve job go with the high performance valve springs for extra insurance especially if you go with a hot cam.
For the street you will want your compression ratio around 9.5:1 in order to use pump gas. You can get close to this through a combination of piston selection and milling the heads.
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