GT kit?

I'm hoping, fingers crossed, to maybe do the 2017 Euro to Italy and would like to use my original condition 150 Special, but as standard it does 55ish tops so was considering an upgrade to maybe the GT 186 kit purely for the reason that if it siezed I may be able to do a roadside repair compared to nicasil and hopefully be able to cruise at 60+mph. I have an original TV 175 cylinder I could use with an TS 185 piston but like the reed valve for fuel efficiency and torque although I have an LTH reedblock spare. The idea was to use a 42mm Clubman exhaust and a 25mm Dellorto running thru the airbox so if anyone runs a similar spec GT kit or has done a TV conversion your comments would be appreciated.Thanks