I would advise against doing this. You probably have semi-horizontals on there right now, which sit below the chainstay. If you put regular track drops on there they will sit about level with the chainstay, which lowers the bottom bracket drop, which is the opposite of what you want to on a track bike. If your riding that fixed your pedals will hit around turns.
Also if you will have to do some coldsetting, and pulling out old drops can be pretty hard, and you will probably break the stays right off at that heat.
I really wouldn't do this, just use what you have.