The Rover-Landers of BC

I am guessing that a range rover classic has a buick engine block.

what other vehicles use the same
-engine
-short block
-long block
-heads
-transmission, etc
as in a RR classic?

makes, models, years, best parts, compatibility, would be appreciated.. or a link if this has been asked before. looking to expand my parts source list.

thanks,
Reza