The frames are a little different where the motor sets Wide Frames are flat and Q/L's are angled at the bottom. The drive shafts are different. The engines are also a little different along with the Electrical and starting systems.
The Q/L's are know for having worn out motor mounts after 30 or so years, this causes the motor to set cattywompus and wear out the drive shaft and attaching parts, along with vibrating the bolts holding the engine to the mounting rails and eventually stripping the threads out of the holes in the oil pan or breaking the pan.
There is good news though... There is an engine cradle modification that can be made along with new motor mounts, that isn't too hard, and will eliminate many of the problems associated with the ISO system, then simply replace any parts that were damaged from running it with worn out mounts and you should be good for another 30+ years.
If I am correct there is a thread in the "Technical Library - Tractors" section on cradel repair that should be a big help to you.
I'm sure I missed a bunch of things but that should at least get you started.
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