Not long ago, we installed a strong-running 964 3.6 into a beautiful Rose Red '73 T that looks totally stock, but runs VERY hard.
We updated the 915 transmission with an SC one and LSD, added two front oil coolers in the fenderwells, installed 930 brakes inside some 911R-spec 7x15 Fuchs, and upgraded the suspension as needed.
Its really a neat car and a total "Q-ship",.....