the thing to do is a f20b block with f23 crank and f23 rods with k20 pistons (f20b has the 95mm mains just like the f23 which has 95mm mains and 97mm stroke... the f20b block is stock 85mm cast iron sleeves... you bore it out to 86mm and fit the stock k20 pistons in it and you are ridin). similar setup with cut down h22 pistons on h-t made 255 whp