89mm bore + 3T crank = 1950cc (or close enough)- Wiseco have pistons/rings to fit these straight off the shelf - this is a 4mm over bore for the 2T or 160 thou in the old money (a fair increase in anyones language).
Head gaskets are readily available from HK$ for the increased bore.
Depending on which block you have you may need to clearance the block for the longer stroke.