Yep, it's a Shorrock supercharger...
That is so cool.
There are several that I don't miss, but the regrets list is longer - '67 MGB-GT, '68 Mustang 4-spd coupe, '67 Mini, '71 Chev SNB PU, '82 XV 920 Euro, '83 VT500 Ascot, '81 XR80 , '85 600 Ninja, and on and on...
That Mustang hardtop was neat. One of three '68s I've owned. 302 4-barrel, 4-spd, disc brakes, posi. It was a ball to drive. I was about 22 years old.