Here is an article on panel alignment (Click here) "Basics of Basics"
but you have WAY more than the "basics" to deal with here. I have been in this business over thirty years and my skin shivers just thinking of installing ANY repro set of fenders and hood on a 60s car let alone what I have found to the worse junk you can buy, Dynacorn.
The "massaging", pushing, "tweeking", bending, hogging out holes, needed on these parts is way beyond what you would ever have to do with original pieces. I would rather install trashed and rotted original pieces and repair them, than Dynacorn parts.
Do you have the originals?
And by the way, "Team Camaro" is probably the best site you will ever find on the Camaro/Firebird body. There is a great bunch of guys over there that live and breath these cars. Click here for Team Camaro