Mate you have to understand that if a motor has been rebuilt. No one will touch it unless you provide a lot of details, the workshop, exactly what was done etc.
Right now you look dodgy as and even if you could come up with the specs and if I wanted a motor I wouldn't be going near this one...
This just reminds me of people who put up their car for sale with no pictures and say "stock car good condition, very good car no problems"; and that's it... I hit the 'back' button so fast rofl