You need to post some photos if you can. There were several versions of the old '50s Poly head engines across Chrysler makes.

http://www.streetrodderweb.com/tech/0805sr_vintage_engines/index1.html
http://webspace.webring.com/people/cu/um_4409/about.html

Below is a '57 Chrysler Saratoga Poly 354.