Numbers Matching?

yea that means that the engne should be the same one as the car left the asembly line with:)
here is some info
http://www.yearone.com/updatedsinglepages/Id_info/mopar/mopar engine ID/engineinfo1.html
i tihink you may find your way to this to but i give you the adress anyway!
http://www.yearone.com/updatedsinglepages/Id_info/mopar/mopar casting numbers/castingnumbers1.html

good luck with that demon! hope you find this info usefull:)