HS4 vs. HIF4 Carbs?

Has anyone used HIF4 carbs, from a later MGB?  Are they as good, or better 
than HS4 carbs?
I was considering using 2 HS4 carbs on a Maniflow manifold from APT, and just 
recently saw a pair of HIF4 carbs offered on Ebay. (Either carb(s) to be used 
on a street-modified 1275.
Ray Lynch 

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