I'm not sure what you're asking. Being a Yank who's only owned a Landy for a year and half, I'm not much of an expert.
The Rover V8 first was introduced in 3.5, I believe, so yours is indeed second in a series of block overborings to increase dispacement, first to 3.9 then to 4.2 and finally, ugh...4.6.
I don't believe that either the Series 1 or 2 Land Rover came with a V8, so that's why I'm confused.
What kind of car is it?