What needs to be changed/done ot fit a by engine in my vt

[Ltfry]

Hi I'm in need of help asap I have a 1998 vt an I have got a vy engine to replace my old one but I only hear different views from every person I talk to what changes need to be made I've Been told i have to Take the sump off the vt an put on the vy motor is there more changes ???please help as i need to change these why motors asap thanx ltfry