[danc30]

Just wondering why you want forced induction. There is plenty of HP available without it. A 427 SB can get up to 500 and even 600 HP. *** Note the comment about the 427 stroker***

Here is a quote from "Badasscars.com":

With Ford small block's, using the 351W block, we can easily make 408 cubic inches and they'll handle upwards of 500 HP, and upwards of 600 HP reliably when a billet main support is installed.
Some people will even get them out to 427 cubic inches, but we don't recommend doing that because that additional .100" of stroke is just too much for the stock blocks to reliably handle for long periods of time. It usually causes cracked main webs.
For the little 289 / 302 blocks, 400 HP or so is about as far as you want to go unless you install a billet main support, which will raise the "reliable" handling capability up to about 550 HP. The only way you're going to get that kind of power out of a streetable 289/302 based Ford small block though is with a power adder such as nitrous or a supercharger, period... unless it's a race trim engine running race fuel.