hmmm we measure how the governor is set in cars a bit differently in Australia, but I suppose it works the same in the end, we do it via RPM not Speed.
Most cars I've owned haven't even been able to get close to were the rev limit is set, most Ford Falcon's it is set at 6120rpm, some Bathurst specials were set at 7200rpm.
However I did own a 1979 Ford XD Fairmont fitted with a heavily worked 302cu Cleveland V8 (not the Windsor), bored and stroked to 333cu, stage 3 cam, 700 holley DP, Eldebrock Performa maniford, genie extractors, 2V heads with 4V valves....it made about 380+ hp.
It could easily hit the rev limiter in top which was set at 6120rpm which indicated a speed of 244.8km/h just by using the 2.92:1 diff and 3spd Auto which gives 40km/h per 1000rpm as a start, I wasn't impressed with being able to hit the rev limiter so I went back to the speed shop and asked them to set it at a more realistic 7200rpm....the car could still hit this with out any problems...I'm not sure if the formula for working out a vehicles top speed is correct but it pretty much indicated that, that particular Ford could do 288km/h...
I don't really know if it was going that fast but fvck it felt like mach 1 at least, the poor Ford was vibrating like fvck but the $3k worth of Koni's and the wide rubber did their job and it was pretty stable....it's the sound that I remember the most...nothing like hearing a Clevo howl at 7000+ rpm...truely spine tingling.
I should add that the Fairmont was fitted with a full roll cage and racing harnesses...I wouldn't have been crazy enougth to try other wise.