Mine held 350 rwhp on my 98 for 50,000 miles. It was still in there when I sold it. I wouldn't put any more horsepower to it than what I did. If he's going to spend that much, spend a little more and get something like a SBC.
BTW, 1100 sounds like a lot to have it installed. I paid 350 for the clutch and 300 to put it in back 4 years ago.