OP appears to be looking for a nice street cruiser. The parts he lists for his current engine look to be making up a real nice build. It may help if he shares what he thinks he is missing from his current setup/heads once he identifies them here. In other words, why the search for aluminum heads now? What do you want your car to do better than it is doing now?
You can find the Head casting information on the outside between the two center exhaust ports with a flashlight like seen below:
