BTW, make sure that 833 is an A body unit. It's a whole different ballgame if it's a B body.
And I'm assuming the 273 is from a passenger car, not a truck. Then you'd be looking for a different pan and pickup. Make sure the 273 is drilled for a pilot bearing, because it has the early small hub register in the crank which means you can't use the later model roller bearing in the crank as a substitute.
And I forgot to mention the need for the 4 speed floor hump.
