I've built about nine of these now and like Rob said that stock pump will take that all day. My 93 fox was 466 rwhp an still had a stock pump in it.
Check your timing, those cars can be tempermental. Find your top dead center and advance your timing about 10 degrees an throw a little premium in there an see how she runs. That's an identical setup to one of my old cars minus I had the matching trick flow aluminum heads an I was running between 10-12 degrees advanced and she ran like a dream no dyno tunes needed.
How big of a MAF are you running 70mm??