Triumph Spit 6 Episode 3 Bringing GT6 Home

Aquisition of the 1971 GT6 Mk III. Parts to be utilized include the frame, suspension, brakes, engine, and a plethora of other parts. I already have a GT6 overdrive transmission and the correct drive shaft.
Later, I will determine if I want to change the original 3.27 differential gears (for the standard 4-speed) to the 3.89 ratio which was the factory differential gear ratio for overdrive-equipped cars...or leave it alone for the "German" option which will retain the original 3.27 ratio coupled with the overdrive transmission. This will provide lower engine speed when cruising but unsure if the "off the line" performance would suffer appreciably.