It's always less expensive to buy a done car than build one. Price out a proper cage, for example.
There's a lot of money to be spent also on suspension, light parts, electronics, etc for a 10.0 car, plus the time.
Depending on how many of your parts you want to use, you might even find a decent roller for not much $$$.
Kinda hate to see a rust-free body cut up, just get a title for it and someone can build a nice car out of it.
Look around, post some photos of what you find, and the guys here can point out the good & bad.