ive got a 8hp Honda motor setup in mine.
you will need to put the motor as Far forwards as possible,
and honestly this would be a great time to weld on a new motor plate instead of the tin plate/factory.
go All the way to Past the original front of motor plate,so you will have your 2 front motor holes available.
other things,pegs,start looking for longer pegs or mount them diff location.
hope you have either a tav setup,or a diff jackshaft than factory,because the motors are wider and the chain will Not align..