You know what, I wouldn't consider any other tranny for a 5 speed swap into the Elan.. In my opinion there is no way the MT75 or the type 9 would be a good fit.. They are quite a bit taller and longer that the 3 rail, and there is little wiggle room in the chassis.
It also looks to me like the shifter comes out way further back than the 3 rail which could make the shifter a pretty funny shape to bring it back to the front of the consul..
The Alfa required a 1/4 inch half moon slice taken out of the frame right where the shifter comes through into the cockpit..( it comes out about a half inch further back than the stock location, and no-one has ever noticed the difference..) That's because the frame there comes together in a v shape, while the Alfa has a very large round shifter housing. The tranny is a little taller than the 3 rail, which meant I had to cut and weld the motor mount bolt holes down about 3/4 of an inch.
It's hard to tell for sure, as I installed my tall block at the same time, and part of ( well most of really ) that drop was necessary to clear the hood with the valve cover at the front.. The combination of the two changes leaves the bottom of the air filter sitting on the passanger footwell, but it's not a problem, and i'm sure the stock block would be a much better fit.
The biggest problem was welding a proper u-joint flange onto the Alfa output shaft to match the Lotus setup. As I remember the driveshaft was the proper length, so no changes there. The cross member for the tranny was easy to make as well...
The Alfa shift is a little heavier than the Lotus stock tranny, because in it's original form it had a very long shifter for leverage, but in the Lotus the shifter is very short. The ratio's are very good, but I think first to second gear is a bit wider than the Lotus box. My motor has quite a bit more torque as a tall block, and just eats it up!
I did have some photo's at one time, and I still have the plans and specs somewhere as well, but finding them after 10 years or so may be a trick. The adapter was designed and manufactured in a run of 6 by a friend of mine.. he is very qualified to do this sort of thing, and the thought,plans and design that went into it is all out of proportion to the limited run of them. He still has one that he is not using.
Now I'm going to go and start looking for the old plans etc.
I am going to be removing my tranny later this summer for a noisey input shaft bearing, and will get some more pics of it then..