i almost agree but then i have both i would say though that with petrol as it is the original FHC does get used more than the Grinnall
but then there is nothing more satisfying than the sound of a V8
[8 whole cylinders worth of punch to ram the world through the windshield and out the rear view mirror. Car & Driver]
1981 Grinnall TR7 v8
1981 Black FHC
1979 & 1980 Black Premium FHC(laid to rest) Sorry
John