Mate o'mine had a nice 86" series one with rover car 6cyl, it was smooth as silk and purred like a kitten. But really juicy! The car engines had a better ally 'Weslake' head fitted as far as I know, landy 6 pots having a longer version of a 4cyl head.
It does look neat in a series engine bay though, v8 crammed in there just don't look right, like your grandad on steroids.