Has anyone got any experiance of the horrors of the head?
Do I just invest in a new block?
Plenty of info on Tech and the Wiki (you willnot need a Haynes you will need a Bentley Manual I imagine)
They don't have block's they have a crankcase and a barrels, so I hope your dad knows that..
Good luck, see you on't hills one day next year hopefully

Talk to Simon B as well...
Elite might be worth checking out for a rebuild... with a guarantee