what rpm were those hp and tq numbers at?? sounds like it may need a better converter an more gear.my day would go througfh the traps at 5900 rpm in third gear.
What gears were you running ? Here are the numbers 413 TQ @ 4300 398 HP @ 5700 . I do a lot of highway , 100 miles a day when I use the car so getting a high stall converter always worried me ,gas is about $7.00 a gallon .