switching out these two engines might not be as hard as you think.
the sub-frame; what the engine and tranny is bolted to, which also holds the
suspension and wheels, is attached to the body by 4 bolts.
all you really need to do to tranfer the engine is disconnect the four subframe
bolts, the tranny bracket, the center driveshaft bracket and the 3 bolts at
the rear flexplate, then wires and hoses and misc. then brace the subfame so it wont fall over. do this to both cars. then lift the car body off from the front bumper (engine hoist, tow-truck lift, backhoe etc.), move it out of the way and put the new body on in reverse.
if i am correct your tranny had a worn clutch. you can change it out quickly
with the body off.

don