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I reckon all twin Webers will do is increase fuel consumption without a significant gain in performance if you leave everything else alone.
The twin SU's should be good for around a 130 BHP on an 1800, but not in stock form
Fitting a later twin downpipe manifold and bigger exhaust, the latter being problematic for 544 is helpful.
Make sure the airfilter and carb are in good tune.
Beyond that you're into:
Compression
Ported head
Hotter cam
sorted ignition
Only then will Webers start to work.
Regards
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