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Hi Brent,
The numbers are casting # used to identify left, right, and bosses for aux equipment.
The 68L cams have identical grinds and the later E cams. Cam timing specs were changed.
The E cams are a nice blend of low speed drivability and upper range performance.
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Aaron.  F.S. 1965 Solex engine w carbs/cleaner
Burnham Performance
https://www.instagram.com/burnhamperformance/
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