Help me tune my 1974 super 150

   i am rebuilding my 1974 super150...i will go10" wheels, malossi 166 cylinder kit,and serie pro race crank.and 24/24G for T5....but which gears and clutch?  i understand there is not much selection for gears ,but if anyone has any suggestions to get longer primary drive or gears....please feel free to respond.....i also have a p150x with polini 177 kit...and i would like my 1974 super150. to have similar gear ratios if possible.i am looking forward to all suggestions!                     

                                                                                         pat. vancouver canada