I have to change the oil pump on my saph 4wd cosworth engine, but hesitating about the oil pump. Should I buy a std one or is an uprated one fine too ? Engine is gonna be a stage3 one (around 350bhp), with fully balanced bottom end, and new pistons rings, head has been checked and is ok, but I'm a bit worried about having more "inside" leaks with an uprated pump. What do you recon ?