WTF is all this crap in this thread?
You arent making the power you should be. On a standard bolt on 4v, you could make those numbers with a tune and probably just mild cams. With the 3.70 Bore & 3.75 Stroke, your engine would be a 5.2L(taken from SHM site), your torque should be in the 320s or 330s and your HP should be in the 330s+. Im making 310 at the wheels on my old stock short block on a 2v and my heads.
Here is a link to Mr. Bob Cosby's 99 cobra with just bolt ons. You should be WELL over these numbers. Im just using these as an example to what a cobra can put down. Im well aware that the 98 4v and the 99 4v are a little different. But I could have sworn the 98s had the B heads( a better head design). Im not too up to date on my 4v knowledge though.
http://members.cox.net/bobcosby/cobra/images/t45sae.jpg