1960s Tropes

I've wondered how the 60s musclecars kept developing into the 70s; they'd have the lairy styling but with the continuing engine development rather than being choked by emissions controls. Imagine the alloy-head 454 tri-carb 71 Corvette, or the Ford Boss 429 engine being more widely fitted.
Given that there was no Oil Crisis in this '60s world[1], I imagine that American cars are less fuel-efficient but all around more powerful. Everything that went by wheels, tracks, or tread in the 20th century hovers in the 21st, so the game has changed somewhat.

[1] My current plan is that the Middle East is wracked by the Arab Cold War between the conservative monarchies of the Arabian peninsula and a more secular nationalist federation based in Egypt, with friendless Israel (jettisoned by the Americans back in '67 as a threat to world peace) threatening everyone.
 
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