Anyone using beehive valve springs on a slant-6?

I’m looking for engine component weights for a forged ('68) 225 slant-6 in a quest of reducing reciprocating mass and inertia [list below] - and am starting with valve springs. Beehive springs are commonly available for LA engines - surely one must cross-fit to the 6 - right?

A piston changes its direction of travel twice for each full crank rotation, and in doing so comes to a complete stop (briefly) each time. Therefore, reducing inertia (weight) can have a seat-of-the-pants feel in terms of throttle input and drivability - at all RPM ranges - not just at the top-end (although that's most often what comes to mind). None of these concerns and componentry are exotic; they are commonplace in even modern economy cars - it's an exotic thought, however, to apply this ideology to a 50-year-old slant-6 engine.

That said, I’m on a quest to find low-inertia parts with an emphasis on selecting the lightest-weight components without a sacrifice in strength or longevity (the list will be short - I know). Not interested in titanium.

Below is a list of other lightweight parts I'm searching for with an emphasis on selecting the lightest weight components without a sacrifice in strength or longevity (the list will be short - I know). Not interested in titanium.

If you have knowledge to any of the weights to the parts below - please state the part, vendor, and weights in grams please. No bathroom scale weights :) Use this converting lbs to grams - Google Search to convert pounds to grams.
This is an out-of-the-box idea - I've already heard I'm crazy and wasting my time with such nonsensical thinking for a slant-6 - which spurs me even more to make this work. Call me crazy... but I'll bet many of you here share the same passion (obsession) to make the slant better.

Thanks to all in advance!
-Chris