Yo Hercules,
You have a set of rare heads. These are perhaps the most high performance cast iron cylinder heads that Ford ever offered for the 429/460 engine family. They are indeed the Cobra Jet cylinder heads as designated by the D0OE-R casting. People pay a lot of money for those heads and they are capable of producing lots of horsepower.
Your heads have a combustion chamber volume of about 72 cc's. Most Ford passenger car heads have chamber volumes of 76 cc's and 92 cc's, so you can see that your heads offer the highest compression. Also, your heads have the biggest intake valve size of 2.25" (vs. 2.08" for standard heads). Finally, the ports are the most agressive offered in a cast iron head by Ford.
You mention that you want to install a camshaft. This is very involved as the camshaft is usually the very first component installed into a V8 during assembly. And so you will need to remove your tunnel ram intake manifold and carbs, complete valve train, front timing cover and pulleys and timing chain. If you are not experienced in this, then I strongly recommend that you seek the assistance of somebody that is.
Finally, you must do more evaluation of you engine before selecting a cam. You at least need to know what pistons are in your motor. Also, if you get a super-radical camshaft, the huge intake and exhaust valves in you heads have been known to touch each other during valve overlap unless some precautionary measures are taken.
I don't mean to discourage you. It would be a shame to lose those heads due to a simple oversight. Do your homework and get some help.
LO