Yep
Here,s one I did earlier
Click on photo to enlarge 
one for fifer me thinks..........Starter motor swop
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You will need to swap the flywheel due to the different teeth but you
might be able to use your old clutch if they are the carbon thrust type
I had an 1989 engine with the carbon thrust clutch , a bu***ed pre-engaged starter and the gearbox was also b***ed .
As I did not have another pre engaged gearbox or another pre engaged starter motor but had about 6 inertia type gearboxes lying about and a new inertia starter motor it was a no brainer decision .
On the starter motor / gearbox swap I did on that one above all I did was change the flywheel and clutch but I did not change the back plate and ALL I had to do was slot the holes .
I changed the box with the engine still in the car and then found that the holes in the pre engaged starter are smaller spaced than the 5 inch ? holes on the inertia starter so I used a Dremel to slot the plate insitu .
I then went into my hut and gave myself a darn good thrashing
You will need to fit a separate starter solenoid as per
Click on photo to enlarge 
one for fifer me thinks..........Starter motor swop
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Swop the flywheel then , before fitting the replacement gearbox , try the new inertia starter on and see what you have to do to make it fit .
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