hiya matey, st24 owner here. gotta say the power is nice a smooth all the way to the top end, and as of yet i havent found a 200 that is faster than the 24.
main thing to check is the waterpump has been changed to the metal one as if the plastic one fails then it can take the headgasket with it and then you might aswell get a new engine.
just look out for all the usual ford bits that go wrong.
you wont be dissappointed.