chevys104x4

my 95 yamaha banshee. rod bearing on crank side came apart. considering replacing crank with stroker. maybe stroker with long rod. what is needed besides the crank to make this work. like porting or cylinder spacers if using spaceers what size, what carbs, do the cases have to be modified, will stock head work. please list what is needed for both stroker crank 4mm and stroker crank with 5mm rods and any other items. i know this is a large request. any help is greatly appreicated. thanks.