WI the musclecar era had lasted a touch longer, even if only 12 or 18 months? Factors could be insurance rates not being so bad, polution and safety laws being a little slower to enact, the business slowdown of 1970 being delayed, among others. How would cars develop in this 12-18 month period? What impact would the Ford 429/460 have, what about the GM 454/455 engines in 1970-71?
Also, what if there were subtle changes to racing homolgation rules, for example only 70 of the 500 Dodge Daytonas built has Hemis, and the Torino Talladega had 428CJs while the Boss 429s went into Mustangs. What changes to racing rules could produce wild and wonderful musclecars?