I've not done it but I would imagine the extra weight of the engine would outweigh the small power increase you would gain over fitting something like an A series 1275. You can get 80 bhp out of a 1275 without too much effort......
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Compare the Minors - Simples !! http://mog.myfreeforum.org/index.php
One of our customers has done this swap to great effect. A few Burton add ons and its producing 120bhp, with excellent torque. Don't worry about the weight difference.
I had "assumed" the original question was based around a standard engine - not one with many hundreds of pounds spent on it Of course if you have an open cheque book things are very different
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Compare the Minors - Simples !! http://mog.myfreeforum.org/index.php
Its still a X flow, fits easily and in std form will beat any A series lump on cost as it fits straight onto the type 9, 5 speed.
What are yo lot like ahh !!!
Of course if you have an open cheque book things are very different 
