Dont listen to all the K-series guys, sure k-series is an awsome conversions for all the obvious reasons (easier power productions, better power delivery, better gearbox, more modern) but everyone is forgetting how raw the B-series is. I drive a mildly built B-series (Head work only) and its a dream to drive, ill be upgrading to much higher compression bottom end soon. IMO, to produce that kind of power from a B-series you must get the turbo option out of your head and concentrate on building the motor up N/A. If youve got 13k to spend go for ITBs, E85 fuel, good cams (TODA, SKUNK etc), do your research on headers, full 2.5in mandrel bent exhaust, a good aftermarket ecu and for god sakes a good tune, GET A GOOD TUNE!!!! As for the bottom end, id run 11.5-12:1 forgies, a nice set of strong and light conrods (do your research) and for the crank, im sure the stock one will be fine, and at the end of it all, get the whole rotatting assembly balanced

Hope that helps