This is curious...while the Wallace Racing site has a B1 code for a base two barrel carb 1961 engine, there isn't a B1 code in either Pete McCarthy's book or the engine production sheet from my PHS documents. They both have an A1 code for the base two barrel carb engine.
According to the engine production sheet from the PHS documents, a 287hp four barrel carb engine in a Ventura would have had a BF code - is it possible that's the stamp on your engine and the 'F' is partially obscured so it looks like a '1'?
A couple other discrepancies between the various sources: The Wallace Racing site lists a 7019070 two barrel carburetor for their B1 code engine, but Pete's book says that was used on A5 and S5 engines which corresponds to a Star Chief base engine or a Ventura engine with factory a/c. Also, the Wallace Racing site lists a 472 cam for their B1 code engine, but Pete's book says that was also used in A5 and S5 engines.
I wouldn't be surprised if there are errors in the records 50 years later, and it probably doesn't make a lot of difference either way.
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