Welcome.
B20 sleeves are well known for being weaker then any other block. Unfortunatly, they're very unpredictable, not all B20 sleeves will fail understress. Alternativly... some fail under almost no stress. So, FI is a crap shoot.

With a 57 trim and such a chokingly small exducer a/r, I wouldn't expect more then 5-7whp/psi. So with 6psi, expect 160 or so whp.

Your stock injectors, and even fuel managment should be acceptable for such low horsepower numbers.

Post up if you need anymore assistance, or advice.