Stroker- want more ponies

"Car is a street brawler that sees the track a few times a year. So is there any room here ? "
IMO 12.2 is a pretty good street brawler
To get more power, you will have to spin it higher,which will require a bigger cam, which will take away its street brawler status,and make it more into a track car. That current cam is pretty big already.
But you didnt give us much to work with: where do you want this 50 hp? And why? Do you want it off the line? Or through the midrange? or at redline? ET doesnt say much about your current Hp. Mph is a much better indicator.