I concur with XfireZ51. There is someone in the Chicago area that does top end porting on a CNC. Couple that with some good intake's. The combo will get you close to the goal. That package is excellent and a well proven product. No need to go into the block (IMO).
That's what I would do if it were my car.
If your thinking about a 368 my opinion is go big 385-402 or leave it alone , the 350 is fine. This suggestion come's from experience with 368-385-415-441's. Opinion's may vary.
Good Luck