What year is your car?
I think some reinforcements were added in 1974. If your is older you might want to look into my build thread.
There is an illustration on this page half way down.
You can also see some welding near the beginning of the thread
Saving a 73 from the crusher...
and just for fun, here is the continuation if you are bored and get to the end of the first one
Saving a 73 from the crusher...AGAIN