That is siezure-inducingly hilarious, when the British are funny, they are very funny indeed. And this writer is definitely from the U.K., if not Britain.
I have had the chance to drive several of these, having worked at a large British Leyland dealer as a "car runner" in 1975 @ age 16. My job was to move cars around, and of course we always moved them a little further than necessary if they had a lot of HP.
The Jenson Interceptor, (for anyone who gives a rat's ass), never came w/ a 360. The early ones were 383s, like this one, then they had 440s. Both of these are Chrysler (Mopar) big-blocks, but neither is a "hemi". The displacement of the hemi motor in those days was 426 c.i., and earlier it was 392 c.i. Completely different motors.
The 440 cars that I drove were pretty nice, actually, heavy and luxurious but capable of roasting rear tires at will. A 440 in any car, no matter how heavy, can get scary in a hurry. "Whiskey bottle, brand new car, oak tree you're in my way."
His discription is doubly funny to me because I always considered the Jenson Interceptor to be one of the better cars in our shop because at least it had a dependable, lump-of-iron, good ole 'Murican engine and tranny. Has anyone ever seen a Triumph Stag on the road? Most were crushed within a year or two of manufacture.