^ Keep in mind, that the B20B4 had slightly lower compression ratio (±9.0:1)than the B18B, whereas the B20Z2 had a higher compression ratio about 10:1) than a B18B..according to my Haynes Manual, the bore and stroke remained the same, so piston design must have changed between the two variants of the B20...

Also, the B20Z2 cams have exactly the same lift and identical lobe separation angle as your stock B18B1 cams do. The B20B4 cams have less lift. In short, B20 cams aren't worth your time. I'd go with Crower..