I was there to witness the dyno run Dave is talking about.
On equivilent restrictors...
Green top power curve was a lot steeper but dropped off sooner, at its peak it was just over 3hp clear of the blue top.
Blue top power curve was more progressive but constantly lacking until the green top dropped off. Drop off on blue top was a 1.5k or so further up the rev up and not as sharp.
Geared and jetted right you could obviously take advantage of either engines characteristics.
My two pence worth, one engine and a restrictor system should be enough.
Most who I know who've ran in blue would take the smallest restrictor on a green top over the biggest restrictor in a blue top if they had the opportunity to do so.
Happy racing!
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