where do I look on the engine to find out what year it is?

The date is cast into the block behind the distributor. ie - A169 would be January 16th '69/'79/'89, etc. If you can't figure out the year, there are other numbers on the block that will pinpoint it for you.

look at the picture on this page.
http://www.nastyz28.com/spmenu.html
from here you can decode almost any number you'll come across.

Thanks guy's, Its a 1975.