Not enough information. The mid 1960's was about the tine Chevy switched from the Muncie SM 318 with a non-synchronized 1st. gear to the Saginaw which had synchro on 1st. Both transmissions could be ordered with the optional Borg-Warned overdrive, although OD Saginaws were exceedingly rare. The Muncie SM 318 and 319 (OD) has four bolts that attach the shift cover. A Saginaw has 7 cover bolts.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!