Model B crank in Model A

[Jim.Morris2831]

My Roadster engine is at Schwalms being rebuilt. They notified me yesterday that the crankshaft is out of a Model B! It's counterbalanced. Does anyone have any experience with having a Model B crank in a Model A engine? Are there disadvantages or advantages? I don't understand why anybody in about 1980 would have put a B crank in the Roadster except for thinking that a B crank would somehow perform better.