Not to sidetrack, but a 3.6 V6 2015 Challenger will run 14.6 and keep up with 80% of the "muscle cars" of the 60's/70's. But again, for the time and era, I think the 383 and 360 did well.
My Avenger RT goes pretty good, there impressive little engines, got to be decently into the 300's gross hp, plus there geared to take advantage of the power they make.
That's a 12.39:1 Total 1st gear
Gear Ratios1ST 4.127, 2ND 2.842, 3RD 2.283, 4TH 1.452, 5TH 1.00, 6TH 0.69 Reverse 2.21 Transfer Ratio 0.95 Final Drive Ratio 3.16 w/ 3.6L engine, engineOverall Top Gear 2.06 w/ 3.6L engine.