I have been talking with an old mate, and he has several 1600 Xflow blocks with cranks rods and pistons as a minimum.
maybe a head or two.

What sort of money do they go for, even if they are bases for a rebuild?

I sold my smokey 1.6 xflow a couple of years ago on eBay, it went for £200 and the bloke drove a 300 mile round trip to pick it up

It had a GT spec head if it makes much difference....