There are only two musclecar eras: the classics of the mid-to-late sixties/early seventies and now.
I see the classic musclecar era as similar to '90s B/W pins. Everyone knows the very best cars of the era (Yenko Camaros and Hemi 'Cudas and BOSS 429 Mustangs for instance) and everyone knows the best '90s pins (MM and MB and AFM for instance). Sure, some might prefer Road Runners to Chevelle Super Sports, just like some might prefer TAF and TZ to ToTAN and CV. But we all have the benefit of hindsight in looking back and identifying the best of the era, whether you're talking cars or pins.
I see recent/current pinball games as similar to the current/recent group of musclecars. Pinball rulesets are deeper than '90s games and the latest games have hi-def displays, while the modern musclecars have improved technology like HUD and MRS and no-lift-shift and launch control (and hi-def displays, too). You might prefer the design of the '90s pins or the styling of the '60s musclecars, but the modern versions of both tend to have more content. But we just don't know which of the current games will stand the test of time and become all-time classics. Will lackluster artwork and off-target theme hold Dialed In back or will its added technology features and interesting gameplay help it become a classic? Down the road will recent games like TWD and GoT be considered good or great or maybe just average? Which of the current musclecars will become classics? And will it take at least 500 horsepower to even make the list?