On paper the Stromberg apparently has a higher flow rate but for performance it is usual to swap them out with SU's. Emissions was the main reason for the change to Stromberg's.
Knife edging etc is for top end and probably only measurable on a dyno. Having a set of short medium and long trumpets might confirm some ideas but needle selection probably the key issue. Are Stromberg needles readily available at a tuners? Filing is a black art and you never really know what you end up with. Dyno time is expensive unless it's being done on a friendly basis!
Don't forget to fiddle with the timing.
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