I hope not. Maybe that's why the quote to replace my engine seems so high.
Seriously, though, you do not have to remove the body to replace the engine. Need to unbolt it from the transmission, and to be safe you should probably remove, or at least protect, the radiator because it's a close fit between the radiator and the fan (maybe remove the fan for more clearance?). Disconnect EVERYTHING else (wires, radiator hoses, exhaust manifolds, vaccuum lines, etc) then pull that sucker out. Maybe remove the hood too to give you a little more room to work.
I know a few here have replaced their engines (Buffy comes to mind) so hopefully they will have something more constructive to say.
Here's a really good write up by Buffy when he took the engine out of his: http://www.vehicross.info/forums/showthread.php?t=18749
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong, it usually turns out to be impossible to get at or repair."
-Douglas Adams, Mostly Harmless