You should be able to expect high to mid 11's from a decent combo. My friend has a 408 small block in a 67 coronet that weighs close to 3700 lbs with him in it, 727 trans, 3500 converter, 3.55 gears, drives it everywhere, has edelbrock heads, small roller in the mid 550 lift range, and will click off consistent 12.00's @ 114 mph. Go get the current issue of Car Craft, it is the white coronet in the mag.