Early Hemi

I have an early Fire Power Hemi. Any things i could look for to help me identify it? or web sites to put cast #'s numbers into to identify size and year?

See what the first numbers are on the front pad.Shoud be 53 to 58 and then a letter.The Nos tell you what year.Rocky

Hot Heads Racing and Research. Go to there web site. Thery have a page that list's all the numbers for Chrysler, Dodge and De Soto