if you look at what the group a cars were in the day of the group b you will see how much of a gap there was,,remember the audi entered and beat it nearest competitor by 9mins!!

if you want to compare the two(wrc and group b) i would imagine a current wrc car with a 600+bhp engine.....FUCKING AWESOME X10 !!!!
i for one would love to see more power in the wrc,the crowds on the roads in the group b days would never be permitted today anyway and i bet there isnt a driver out their who wouldnt want to drive a wrc car with double the bhp

as for old v's new i think unfortuanately it would be close,wrc handling and modern power delivery and braking v's brute power!!

but hey!! you gotta love brute power