I aked in a diferent thread this morning but what is involved in the rebuild?
Is it bigends and rings aka kero rebuild because it sounds a bit dear for that.
Or is it a reconditioned bottom end i.e. short motor because i would reckon it would go for quite a while after one of those.
Did you try alex?? he does some of that stuff like wales drag motors and ducatis and stuff and as it hasnt grenaded yet if you took the engine to him it might not be so bad.
We used to do them at home when i was a boy....dad was a fitter mechanic

so replacing a piston wasnt a big issue.
Could just crack the engine and slip in bigends if it doesnt look too sad like big scoremarks in the crank but it doesnt sound like there will be.
Or you could sell it to me.
