you need to research some b20vtec builds, that would help you plan your own. there are a lot of all motor b20vtec builds out there!
b20b block with a b16a head yeilds 9.2:1 compression
b20z block with b16a head yeilds 9.6:1 compression
these bottom ends in stock form do not like to rev past about 7000 rpms, and with the relatively low compression, they are not that impressive. trust me i know, i own one. my integra is just a hair faster than a gsr with similar bolt ons and only made 160whp. so that being said...
you will need aftermarket pistons and rods to build a powerful, reliable NA b20vtec. if you put some higher compression pistons maybe somewhere between 11:1 and 12.5:1, and some decent rods. then add cams and valvetrain, your usual bolt ons, and a good dyno tune and you could make 200+ whp.