RE: Welcome to Club SAITO !
I alomst bought a Morris Minor once. Cute little car sort of like a Mini. I suspect that an engine that changes personality with the barometric pressure and moisture content of the air is over carbureted. I had an Alfa Romeo Spyder Veloce with Weber carbs once. On a hot day she was logy and soft on acceleration and on a cool damp day ran like the hammers of hell. I miss that car. I love the Italian car but very much dislike the quality of materials and workmanship. A Ferrari may be the exception.
Cheers,
Bill