Well tbh your never going to hit top speed of this engine in a 35 year old car that handle like crap unless you have a death wish so compar the st24 against the st220 in a quarter mile strip, st220 is 15.27 seconds and the 24 is 15.92 ,now given that's a heavy lump of car I think in the fez with no cats,no auxiliaries running apart from the alternater and the fact it's being remote turbo ,watter meth injection to stop nock, I think it will do o.k and not much in the way of tuning parts available for either 220 or 24,I know the stats look slightly better but in real terms thers not much between them and the 220 uses speed sensors for speedo and ecu so a nightmare to get to work in something else,