would it be possible and a simple swap? i found a gsxr 1994 750 that is declaide scrap, but the bike looks fine, could i swap out the engine and put it on my gs500E? how hard of a job is this?
Anything is possible with the right tool and skill set.
Don't expect it to be a simple job because it won't be. Not trying to deter you, just keeping it realistic
seriously moding the frame you could, the GSXR engines are a tad taller i think, but mostly they are 2 cyl wider and wouldnt fit in the perimeter frame of the gs500.