HI THERE SIXER FANS

I AM A NEW ZEALAND OWNER OF AN 1985 M6
THE CAR IS CURRENTLY UNDER RESTORATION I AM WANTING TO GET A BIT
MORE HORSEPOWER OUT OF IT. I HAVE HEARD OF REPLACEMENT CAM GEARS TO
ADVANCE THE CAM TIMING WITH A RESULT OF ANOTHER 25 HORSEPOWER.
AM ALSO INTERESED IN CAMS AND COMPUTER CHIPS IF ANYONE HAS ANY
INFORMATION.
INFORMATION ON ANY OTHER POWER INCREASES WOULD BE APRECIATED

REGARDS WARREN