Youll be able to keep up with VTRs and 1.4 SRI Corsas but youll never be able to keep up with the VTS, you should be able to keep up with majority of mk1 corsas, fastest is the GSi I think running at 0-60 in 9 seconds. Same goes for mk2 Corsas, fastest is the 1.8 16v at 8 seconds.
I say keep up though cos youll never be able to cane the likes of the SRi models and that, 0-60 around 10 seconds similar to the RT. My RT will run 0-60 in 10 seconds on average, late 9 seconds on a very good day.
Tis possible to 130bhp out the 1.4RT though, go onto RSC forum, someone with extensive hill power mods on the 1.4 which pushes it up to 130bhp, RR I think.