Not much to add to David's post except to sing praises of conversion.
Mine was done 20 years ago by previous owner who did a lot of continental touring. I've achieved 28 mpg on long runs at circa 65-70 mph and 25 mpg when in the 80-95 range, in Europe this summer.
I've got 2.8 at the back so at 65 mph I'm 1400/1500 rpm.
I don't think it's blunted performance - it acquitted itself well at recent sprint at Southport.
Mine's on manual switches so overdrive is on a stalk off the steering column and lockup on another separate switch. It sounds a faff but in practice one just flicks in an out of overdrive as required and I only engage lockup on motorways/ long runs.
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