hi all , my mk2 16v engine is in need of a rebuild dont know wether to get it done up to standard spec ......or go for a 2ltr rebore with polished head and fast road cams,do you think there will be much difference in perfomance between the 2 , any 1 recomend the best cams 2 use ie fast road,rally,or race....thx for any words of wisdom..