TVR also used Ford 4 cylinders, BL fours, Ford V8s and 3 litre Ford Essex 6s. Later, TVRs used their own engines too. Customers put all sorts of other powerplants in also.
Speaking of the aluminium GM V8... It is public knowledge that I am NOT a buick person. At all. So I take mild umbrage at people always calling that engine a 'buick' ; Oldsmobile had a version of the same lump, and it was slightly different. The problem that Rover had was they used the buick version; Olds' iteration had less head gasket issues for example. What many do not know is the Oldsmobile version of that engine formed the basis of the "Brabham" that won the World F1 Championship in 1966.

And I certainly agree that the TVR is probably the most handsome of the new cars that year; the 'new' Griffith is one of the better looking open sportscars in any era imnsho.