I worked at Buick engine plant from 1990 to 1995 and heard stories about 1964 Rivieras with 4-speeds but never an Electra. Another clue to being from factory might be how the whole for the shifter was cut out. An Electra would be easier to make than a Riv because it has same front floor and shifter as a Wildcat that got 4 speed. The Riviera stories stated that the shifter arm was welded up to get it to the correct angle since those cars were never meant to have stick shift. If you ever worked for GM you would know that if it was physically possible to build something it was probably built, whe