If you have the HP and weight (easy to assume weight with an a body as there are tons of similar examples) the gearing isn't going to be all that critical with the stump pulling torque of a BB stroker. 3.23-4.10 gears are going to yield very similar results. Auto or stick isn't going to matter much either. We're talking about the mph in the quarter which is the indicator of hp. Less than ideal tires or shitty suspension will effect e.t. but (I care little about the e.t.) but, in this case, it's not terribly off. They gave gross HP and assuming a weight of 3,400 lbs., this car is a BIG underperformer! As in one plug wire off!
We make 600 hp with very conservative 505 with 11" converter and 3.54 gears. At 3,700 lbs it runs almost identical #'s to what this car does. 11.19 @ 121 mph.
Just because you don't understand what I'm saying doesn't mean it isn't true.
Like Andy said, the car either weighs 4,800 lbs. or doesn't make anywhere near 650 hp. Logic tells you it cannot be that heavy so why is it such an underperformer?! Honestly, 650 hp out of that combo of parts isn't that great either but it isn't making anywhere near that!
I'd take offense to the "smart ***" remark but I see you are from New Jersey so that explains a lot including why we are even having this conversation.