Rebuild kits

Hi all, just curious if anyone knows where to get reputable rebuild kits for kz440 ltd engines. I ran mine out of oil earlier in the year and I'm looking to attempt to rebuild it.
Might just be a top-end rebuild I haven't started taking it apart yet but it could be a complete overhaul. If anyone's done this kind of thing before maybe you can reach out and point me in the right direction. 
Thanks 

There’s really not a full engine “rebuild” kit per se like common automotive engines like SBC and SBF V8’s.  You can get gasket kits, piston kits, maybe some seal kits separately but no 100% complete “everything you need in the box” kit. 

Later, Doug