depending on where you live some of the members on here can supply and fit a new head
god knows how warped the head is as a result of overheating
600 quid + imo
best off finding a 2nd hand engine and fitting it as you gonna need to replace the chains, water pump
worth pming Vocky to see if he can help !
agree with what vocky said about water pump failing causing HG failure
strange how gunk only came apparent after they took out the stat