No different to adding an overdrive trans to any other Olds or Pontiac, but be aware that's a chev trans and you'll need to add adaptor plates and move trans mount and shorten driveshaft and rig up carb linkages to suit. Nothing new, trans places have been doing these since the transmissions came out. Already a wealth of information out there. Do a search on your engine type, assume Pontiac 455 and with 700 trans.