tci 904 or built 727

dear concerned i'm drag racing a 72 dart 360 ,904 trans and 8 3/4 rear 488 gears, cheata reverse manule valve body,4800 stall converter. no nos. 33x10.5x15 mickey t slicks. 1/8 mile times are 6.9 60ft time 1.46 I cant brake the little beast. the 904 is about 85 lbs lighter then 727. go with the 904 and if you need to go a little stronger go up to eather the 998 or 999 which have the same 904 guts. go for it ! Gary