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It will change you compression ratio, plus I think your need to drill a hole to put a stud in for a pulley at the timing end. Search it the chaps that took over jms used a 197 head for a turbo conversion. Hope this help.
your car is probably got something wrong with it but you cant just say its lost 80bhp just because it cant get past a 98bhp saxo, its not that simple you got to think about power to weight ratio, power deliver, drivers ability etc etc etc.