Update:
Ive pulled it back to bits again and the head is perfect as I thought it would be.
There is marks on the bores, not very harsh but all the same Ive drop the sump off and pulled the pistons out and this is what ive ended up with,










Looks like theres been some det going aswell.
What the hell has caused that damage?
It was fine before any headwork was done.. The car was starting and driving fine.