Looking at 'A chip of[f] the old block':
I searched for 'chip block' (without quotes) on http://blplaybills.org and found mutliple playbills with 'Chip of the old block' at Theatre Royal Haymarket between 1809-1815, 1816-1822, 1794-1819.
More interesting, the same play with the same spelling is on a playbills for Colchester, Covent Garden, Birmingham, Liverpool...
May be the accepted spelling at the time?