There was an article in PHR a few years back with a 400 in a Duster that got into 12s with stock 400 long block. Intake, carb, headers, cam and springs. I don't remember what gears they went with. They were testing the various Mopar cams in it and I believe the purple shaft .509 was the top performer. The low compression will be very forgiving on the crap fuel we get and will allow some very aggressive timing. A good pocket port and port match is always a big plus.
