....Is this engine worth?

NOT A FOR SALE ADVERT - I JUST NEED SOME ADVICE ON PRICING

Ford Sierra Cosworth Engine - 2wd - Less Ancillaries (spelling)
Group A headgasket
Group A Timeing belt and tensioner
205 Block with new rings in 2003 (bore is 0.5mm oversize)
Head has been fully rebuilt - (pistons and bores checked while head removed and told they were spot on)
engine has 106k on the clock but only done 3000 miles since Nov 04 as I lost my job and do not drive it.

Engine was a bit noisy but still drove with no problems at all..Was told to change the shells and engine would be spot on again but im not a mechanic so couldnt say..

So anyone tell me a price i could sell this engine for?

Thanks for any help you's can give me