Ummm, well, 450hp to the wheels has been done before with ported heads, cam, and the right bolt on mods on the stock bottom end. People have done it many times with 347's, so why not 350 shevies? Those motors have 10.5:1 comp and can be bumped to mid 11's plus (milling heads) and run a pump gas no problem. F-bodies run very fast with the right mods.
Here is a vid of my buddy's car. Home ported heads, off the shelf comp cam, and some bolt on's. The 150 shot was without a bottleheater so he was running low bottle pressure.
http://videos.streetfire.net/video/A10A745F-14A0-4980-992C-1ED2C271155C.htm