You didn't mention heads, but if they are stock, then on 14psi or so, I'd say 700hp on an aggressive tune.
That intake will work fine.

I think 900hp is realistic, however, when ppl say "easily 1000hp" "should be no problem" etc etc, that's bs.
It takes a good engine, good tuning, good parts for an engine to hold up to 900hp.
Yes, any engine can probably make 900hp, but who wants a one hit wonder?

If you're talking 900hp at the tire, it's gonna take some damn good timing, good amount of boost, and larger injectors imo.
That a1000 will be just barely enough.
Go overboard on the fuel system if you can; last thing you want is to see fuel pressure dropping after all the hard work.
Correct plumbing of the fuel lines will be critical as well.

ya ya, i know i'm gonna hear about so and so made this much.

Don't forget the transmission; at this power level we have decided here that a th400 will be used.
Unless you like replacing transmissions, which some customers do, no biggy.

i know, so and so made a million hp and has an 80e lol.

looks like a good build, keep us updated.