Hot Rod, start a new thread on your Nova project. Though you are welding it, welding is actually only a small piece of that process, it deserves a new thread.
Tell us about the quarter you have and where you plan on splicing it, that sort of thing. You will gets tons of help.
You want to cry, I had a SUPER CHERRY, zero rust 64 SS Nova when I was a kid, we are talking 1977ish. I chopped the top, never finished it and sent it to the wreckers!
I see you are 16, guy, you are going to have an easy time of the job, with the forums help. I wish to God I had this sort of advice when I chopped the top on my truck at 16 back in 74 (see photos).