what hp can a 742 case 8 3/4 handle

I have been as fast as 10.49 in the 1/4 with my 73 dart. It weighs 3520 with me in the car.i have a 742 case with a set of Richmond 4.30 gears.i have about 20 passes on them and so far so good. now when i first got the carb ruining i had a set of Richmond 4.10 gears in it.my best pass that weekend was a 10.66 but blew up the 4.10 gears on the cars 5th pass.on that pass my best 60 ft was only a 1.56 and on the 10.49 pass it was a 1.48. also my 8-3/4 has been back braced.