RE: OS 28xz or LRP zr.32
You could also sell the OS, maybe for a small profit.. - and put the proceeds into other things - tires, pipe, clutch, spares, tuning, whatever... If you got it for such a good price, and can't afford to buy a roller for it, then selling it would put you ahead..
If you can afford it though, I say get a used truggy roller and put the OS 28 in it.. Awesome engine by so many accounts - so piece together a truck around it..