Dude who told you that.
some same 400 but even thats pushing it depending on how many miles on the engine. Safest bet I was always thought was 360-380 bhp on standard internals. When I called aps guys they said 400bhp was fine as its not so much the bhp that effects the engine but more the torque.
Best bet is to talk to the following who I found gave me the best advice:
prescience, tere and big phil
You need to read the posts lad - "non standard internals".
doh
what did baptist have on his as he rebuilt his block, 530 wasnt it?