Back when they were new......
Popular Hot Roddjng tested a 71 440-6 Charger Super Bee with 4.10's/auto, it went 14.2@99.
Car Craft tested a 71 440-6 RR, also 4.10's/auto.....they got it to go 13.7@101.
I'd say those are the bench marks to shoot for.
Not an apples-to-apples comparison by any means, but...
When I first bought my Challenger with the 440-6 on a stock '70 long block & MP 272/.455" cam, it was slippin' & slidin' to 13.7s at 101 on hard Goodyear 235/60R15s.
I put a set of M&H 275/60-15 bias-plies on spare 8" rims and it dropped to 13.2s at 103 simply due to better traction off the line.
The car had 3.55s and an OEM 2200-stall converter at the time. Too much gear and too much stall with marginal tires will just make it worse.
