Re: 1400 16V rallycar
The twin-cam and carb rule goes back the days when they wanted to ban Gp4 RS1800's, Gp2 Lotus Sunbeam's, 911 RS's and TR8's from road rallying (same goes for more than 4 pots and arches).
The crazy thing is that you can have a 16v engine as long as the engine originally had EFi and the throttle bodies remain unaltered.
So people can enter road rallies in BMW compacts with 4 pot M3 engines, you can stick a Honda S2000 engine in a MkI or II Escort (Yuk Hodgson has a S2000 engined MkI, but that is a stage car), loads of people run 250bhp red-tops in Escorts and Nova's and a MI-16 engine in a 205 is fine - but a totally standard 1968 Alfa Giulia 1750 is banned (a 1965 Sprint GT like mine is fine though).
I've done a few road events in a twin-cam Alfa and a Triumph GT6 (1968 and 6 pot) and they are no noisier than a Mini Cooper S with a straight cut box, but they were run on Navigation permits.
Something has been lost along the way - but the HRCR are fighting this and even used the Alfa and GT6 as examples.
One day it might get sorted, but I thing we'll all be competing on road rallies in sub-1400cc hatchbacks by then if it hasn't been banned already.