To back up the estimated power figures of the 4AFE, here's an example. As fate would have it, a friend of mine overseas has built an engine almost identical to what I will be building. It's in an off-road buggy and on an engine dyno it has made 248hp at 9,000rpm.
It's almost identical in every way, except the advantages mine has is that I'm using the better head, bigger valves, 1mm bigger bore (~40cc's worth), a better ignition system, and a more efficient oiling system. The advantage the buggy engine has is that it uses bigger cams.
So all in all I think it's not unreasonable to expect a similar power from my engine.