10-11 second combos with hp weight gear ratio

My wife's dead stock '66 , /6 automatic w/manual brake and steering weighs 2810.

Add up the extra weight for the drivetrain you have and then subtract for the replacement or missing parts. AKA, aluminum, fiberglass, missing jack, etc.

That should be about as close as a good guesstimate gets until you hit the (accurate) scales.