Welcome to TeamCapri!
You're pretty open about beating on your car. So I'll be pretty open regarding your wants:
-200hp is not attainable out of the stock engine. Swap it for a bigger engine, or get a turbo. 8k RPM requires a $2500 valvetrain and even more in the bottom end. 7200RPM is the highest safe RPM limit. Your stock ECU limits you to 6800. These engines do not make their most power up high, it's not a honda. The sweet spot is 3500-5500.
-Beating on your car is going to make it break. The transmission you have will give out if you continue to abuse it. They are not strong.
-As for immediate upgrades to ensure her survival, im not too sure - A capri is a special animal of a car, parts are sometimes hard to find and upgrades even harder. You will have to get creative with some parts.
This forum is here as a resource for you, & everyone else. There are plenty of people who have been there before you & have posted their discoveries & stories - if you look around, and search - you'll find the answers to most of your questions here.
-Rocket