I will be corrected if I'm off base here but based on a few general things I see they look like 1970 VC's. The '69 covers had a square corner near the oil filler. Both of yours are clearly notched ala '70 style. Secondly they both appear to be left side covers. Last, all '69 and early '70 Boss VC's were chrome plated, not painted. Other than the drip rail inside I'd almost believe they were from a 351C and not a Boss 302.
As I stated I'm sure others with more extensive knowledge here will correct any errors in my observation, but based on my limited knowledge that's what I see.