Richard gets 350 hp out of a stock 5.9l longblock with 4bbl headers and a 212 cam, I would say the 5.2l would get similar. The 380hp crate engine gets 400 hp with 230 cam so your cam is about in between so I'd say should maybe get the 375 hp.
The 5.2l is gonna need about 500-600 more rpm and higher stall and about a half a ratio deeper gear to perform similar as a 5.9l. So that's up to you if that's fine.
Here's a basically 400 hp 5.2l (318 with magnum heads)
