If you're just changing the engine, there's no reason to mess with the transmission, or even unbolt the rear motor mounts. All you'll need to remove is the starter since it bolts into the bellhousing. My 59 Suburban had a 283 that I replaced with a 307 that way. All the bellhousing-to-engine bolts are accessible on a V8, not buried behind the flywheel like on a stovebolt six.
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!