i think your looking at 350hp on the high side with 290/300 ft lbs of TQ.
The car will most likely run 9.60 range @ 68/70 MPH in the 1/8..This is just My opinion based on what i had at 16 yrs old.
Little more stall (3,000) and More gear (4.30) with 26 inch tires will make a huge difference once he gets ready to get a little quicker...and should get you more towards the 9.0 range...right Now she is gonna lug some with the converter and Gear..cause there's not a whole lot of motor nor gear,converter to get the heavy car moving
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Bjuice..
"I'M YOUR HUCKLEBERRY ! "