to be honest mate if u could find a cheap enough st170 engine u could be better off throwing that in, for what ive spent on mine so far plus a chip which im yet to get proberly cheaper throwing the engine in...

if not fit the 2litre cams and ecu onto yours there 15bhp straight away and with the st170 filter n snorkel and exshaust you prob upto ur 150 bhp mark!