When I was in high school one of my friends, a neighbor kid who was two years older, had a Rover SD3500 (mid 1980's vintage) with a 5 speed manual. It was an ugly and unreliable beast but that formerly Buick aluminum V-8 it was plenty fast and could lay an impressive patch of burnt rubber.
My aunt had a 1965 Ford Mustang 289 C.I.D. V-8 with a 3 speed automatic which my grandparents had owned before her (bought new in 1965) which she would let my cousin drive before he wrapped it around a tree. Believe it or not the aluminum bodied Rover was faster. I believe my bad's mid life crisis car of a 1986 Fox body Mustang 302 C.I.D. V-8 with 5 speed Mustang was faster though.
There is no replacement for displacement as they say and a 5L had more get up and go than a 3.5L Rover.