Man I just looked your slips over again and man you gotta have a few issues going on. My sons duster that weights 3200 pounds ran 10.11 with my old 408 that I pulled out for its fourth rebuild. This was at keystone in summer heat. Edelbrock headed 408 with around 11.1 compression, 650 lift roller cam, 750 alcohol carb, 727 with 4.10 gears, 5600 stall. Shifting at 6700-6800 rpm. With his old stock crank 360 that ran 10’s he gained .5 going from a 4600 stall to a 5600 stall.