Hmm, fuel efficiency and power output are pretty relevant to most people, as is reduced engine size and weight. And cost. Everything's a trade off, and I don't think many people care about thermal efficiency if the power plant is making the numbers at a reasonable cost. Why am I falling into this trap...
Anyway, a large displacement engine with giant reciprocating slugs is never going to rev into the stratosphere, and does not really need OHC. Unless they go lower displacement forced induction, or hybrid electric assist, etc., there is nothing wrong with constant improvements to the current design. The Viper engine could use the enhancements that the Vette has for sure - but it all takes time and money, neither of which SRT had this go around for Gen V. Hoping there is a future, hoping they are working on it now behind the scenes.
As for 'drag racing', isn't that what the Challenger is for? Drag Pak? Keep the Viper as a track weapon.