the stock short block can handle 400 hp and have seen some make more.that is if it is fresh. mine is in the 250/275 rwhp range but it is not new. I bought the short block off tr for 100.00 burnt the ring lands on my old one (cranked the boost a little too hi ) when I had it apart I ported the head put a ranger roller cam. it already had a pe computer 3" exhaust t/coupe intercooler big vam ported e-6 exhaust manifold. the stock turbo is good for 300 hp if in good shape.[I] have seen complete motors with turbo for 300.00