W-2 Econo heads

Desperately in search of 1 W-2 Econo cylinder head. This is the W-2 that has the rocker shaft stands cast on the head. Mopar P/N 3870810E. I'm also interested in all other versions of the W-2. Trying to build a nice street/strip 340 on a /6 budget! Let me know what you've got.
Thanks, Jim