engine swap(250x to 350x)

trying to figure out exactly what i need to do the 250 to 350 engine swap, or were i could get the necessary parts to do the job.any help is appreciated!!

Powroll.com sells the complete kit

[TheX1992]

im going to do the exact same thing as soon as i pick up a nice RUNNING 350x engine. im gonna go look at junkyards for some atc 350x's that some guy ran into a tree and frame is shot but engine is fine. let me know how it goes.