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The flat skinny one is a harmonic damper. It stops the valve from finding a frequency where it vibrates like a tuning fork, and won't let the engine rev faster than that rpm.

Yep, the D0OE's and C9OE's are the ones to get. I have half a dozen C9OE's and they perform great.

Okay, the D5 is 1975. A means Galaxie, Z is Ford service parts (replacements?). 6049 is the number for all heads. B is 351-2V. They'll be small port, big chamber heads. Nothing to get excited about,...

Well,the D5 means 1975, but the rest...???