You cant really imagine

While I had a 66 Countryman with an twin carb 1100 transplanted in it, that was pokey enough but a friend had a 1300 in hers...you simply couldn't pull away quickly at junctions, the tyres couldn't grip and it just used to bounce and tramp itself along until it found some grip.
A tad buttock clenching when you got it wrong.with traffic bearing down on you . Those were the days when you thought of something and just did it
Rest of the cars were pretty standard...probably explains it