I believe you may want a specialist Rangie garage in Norfolk - Ive used Horsford-based V8 specialists / Partsrange -they are superb on the P38s and have loads of used spares plus all engine bits available. Had them do my Rangies mot last year and fitted Konis and hi-performance ignition leads for me, checked out the Coscast blocks etc they have available. Owners name is Chris Crane, nice guy, knows his stuff.