Normally people bore a B16 to gain more displacement while maintaining the short stroke (77.4mm).
Theoretically, the longer the stroke, the lower the redline.
However, a 'big' bore B16 can mean only 1mm bigger (82mm) or 1.5mm bigger only (82.5mm). Still smaller bore than B20 (84mm). If the B16 block is sleeved, probably can bore bigger.
What people want in the B20 block is the bore (84mm). What people don't want in the B20 block are the weak sleeves (different design than VTEC) and the long stroke (89mm).
Some in US use B20 block with B17 crankshaft (81.4mm stroke). I don't think we can find B17 easily here.
iam prefer a longer stroke den a bigger bore, this has been the formula in all my rides and it works so far. boring the cylinder to gain more power isnt thing, i can always strengthen the block and increase the boost, safer imo