I've got a 59 Burb with a 307 engine, a 4 speed, and a 3.73 ratio rear axle. It towed a heavily-loaded Datsun station wagon full of clothes and household goods all the way from California to Tennessee with no problems, plus the Burb was loaded down so heavily my wife barely had room in the drivers seat for herself. I was driving the big rig- - -a 1970 Cadillac Fleetwood towing an 18-foot 3-axle trailer with over 10,000 pounds on the trailer axles. We looked like the Beverly Hillbillies, headed back east! I also used it to tow a HEAVY Norris 22 foot travel trailer on occasion. No problems! Set the 283 up with a Quadrajet carburetor by using a factory aluminum intake and carb for a 305 engine, a set of ram's horn exhaust manifolds and dual exhausts, and a Comp Cams 260H High Energy cam. It will handle your towing chores without any strain at all.
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!