Shaving the head and installing the AU head gasket, whats a good cam to use, bearing in mind I still want good economy but more midrange would be fantastic.

Car is run 99% of the time on LPG so it has an octane approximately equivalent to 98ron PULP so would any cam suitable for an engine designed for 98ron be suitable for LPG??

you might want to talk to the mob at http://www.wadecams.com/