what hp can a 742 case 8 3/4 handle

what kind of horsepower can a 742case 8 3/4 rear handle in a 2800 lb duster dont know whats been done do it running 29.5x 11.5 x15 slicks now thinking of going to 28.5 do to my 5.17 gear ratio the leafs have been moved in 2 inches and have 2in spacer blocks for height going to launch at 3500 think she will hold up with 600- 650 hp. yes i know a dana would be stronger but this is what i got for now. Appreciate you knowledge long time gearhead but new to bracket racing. its a foot brake car for now!