[Wayne 962]

There are two basic types of cam towers - I don't know if you can accurately determine anything from casting numbers - they might have different numbers for the same part number (multiple castings of the same). I don't know.

In general, there are two different types of cam towers, the early 3-bearing ones and the later 4-bearing ones. That's basically all you need to know on that.

The chain housings - there were several, depending upon what was bolted to them.

Heads - you can figure them out by measuring valves, ports, and by looking at the date stamp on them...

Hope this helps,

Wayne