Nissan Transmissions that will bolt up to the Infinity VH45de and fit in a nissan 240

[trick240sx]

I am purchasing a Infinity Q45 1991. I plan on building the engine for a twin turbo set up as well as 700 and up hp. Once I reach 600 hp it will be swapped into a 1991 nissan 240sx. The weight ration should even out since the vh is all aluminum and the ka is steel block alluminum heads. I am looking for a factory trans that will bolt up to the vh and handle about 500 hp for now from the factory. Can anyone help. Also I am trying to figure out how I can lower the compression on the VH45 so it wont be so high when I do the turbo setup. right now its comp ratio is 10.2:1. I would like something like 9.0:1 or a little lower. Will pistons and rods do the job or will I need the pistons rods and crank reworked to accomplish that.