Need some advice please!


Well-Known Member
You could do worse than read the P6 owners club guide: Buyer's Guide

It's not really a complex car by any recent standards but it also is not a Morris Minor or MG in terms of mechanicals and support. The V8 is straightforward for mechanicals, the 4 pot more specialized. Rot and grotty trim are the big expenses.
You could also do better..

James Taylor's Rover P6 book really is the bible for these days. The 2020 version has the most up to date information.