stealth heads on a 383?

here you go.

http://users.erols.com/srweiss/tablehdc.htm#Chrysler_Big_Block

And here are some of the best 906#'s I've seen but this is not your average...
http://moparmuscle.automotive.com/108518/mopp-0906-mopar-906-cylinder-heads/index.html

There's all kinds of reading just google mopar head flow, bb mopar head flow etc.

Iron Big block heads can be ported and are usually enough for most ot street engines but cost wise they are not compared to the stealth's.jmo