building a new car got a few qeustions

ok its time to take my 91 caprice wagon apart so I picked up a 1997 buick park avenue I'm building its gonna be a daily drivin street car but I would also like to get it some what competitive ....I'm waiting on the title lean to go threw but I'm reusing gear from the caprice along with other stuff

so far I have
kenwood head unit with 12v pre's
2 kicker 07cvr15"s
1 rockford power bd1000.1
2 capacitors
2 maybe 3 red autozone brand batteries (2brand new 1 used needs to be tested)

I also have enough extra 4 gauge wire,fuse, and distro blocks to do 2 runs of 4 gauge to the trunk

the buick also came with a nice quality custom built huge sealed box for 2 15"s in the trunk I was thinking of circle porting it as an experiment.


but my questions are:

are the CVR 15"s worth using to compete or should I sell them buy somthing else?

will I have any issues runing extra batteries on a stock alternator?

and does anyone know a good amount of cubic feet to run these cvrs ported? in my wagon they they have 8.5 cubic feet but that car is huge and I dont want to lose the whole trunk of the buick

This a tough one,. But loose the caps.run 1/0 from the alt. Get 2 good batts for the back. Your stock alt will work. But I would use a charger to bring the batts up after a run. And at least l5's for subs. If you can afford some rd hw's you will be done wishing your subs your subs would hold up.

What model kenwood is that, I have never seen a kenwood hu with 12vlt pre outs.

I was mistaken on the head unit lol they arent 12v I used to own a line driver that went up that high ......but its the Ez700sr its not pretty or flashy but its the favorite out of all the ones Ive had