I have a 72 Vette with a 78 front clip and doors.  I am going to put a 72 front clip back on the car but was wondering if I can replace the internals of the doors to change back to early style or do I need to change the entire door.

Someone can chime in here, but I'm thinking the only difference in the 72 and 78 doors (other than possible coupe/convertible for 72) is the interior opening mechanism.  It's possible the 78 doors have the required mounting holes for the 72 interior door opening mechanism.