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i dont see a problem with twin 1.5 inch carbs, dont forget 60's A series engine tuning a swap to twin 1.5 carbs was common and they rallied minis with twin carbs as big as 1.75.
1300 spits all had 1.25 carbs, european 1500's had 1.5s, and slightly less power due to a very mid cam fitted in the name of emmisions fit a BIGGER cam in a 1500 and you will see a good power increase, and a see no reason why twin 1.5's wont give a power increase on a modded 1300 engine.
i suspect the only reason late U/S/A or Canadian spec cars had a single 1.5 carbs was again exhaust emission related.
su carbs are very forgiving, unlike a fixed jet carb going too big doesnt have much of a down side as given the correct springs they wil only open as far as needed so they wont suffer really low airspeed and poor performance compaireed to say a oversized weber or one with excessively big chokes in it
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