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I'd use it maybe with some viscosity stabiliser added to make it more viscous. It is no doubt of higher specs than what a Model A needs (as are all of the modern oils.)
Although it is much thinner than what most of us use, it no doubt would keep the metal components apart.
When building a high performance motor, it is important to have as much oil flowing through the bearings as possible (to cool them). Might even find that it is better than thick oil. It is worth noting that oil film strength is not so closely related to viscosity as it used to be because of the additives they put in there nowadays.
I bet I get lots of feedback on that one!!!