Twin SU's will always beat the Weber 32/36. As long as the throttle spindles are good and tight the SU's just need the correct needle and a bit of setting up. The Weber rarely has jetting that is a good match for the B18/20 and it's difficult to set up unless you have a box of jets and the money for some dyno time. It can be very fussy to get it just right.
Basically B18 used D type OD and B20 the J type. A type not used on Volvos. Early Triumphs used A I think.
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