7260 big enough???

Hi, building a 8.75 for my all steel bodied 67 Barracuda street bruiser once it comes back from body/paint. The car will have a stout 440 with a 4spd coming back to an 8.75 filled with a 489 cased sure grip and 3.91 gears. I purchased the rebuilt 489 off a fellow member on here. It has a 7260 series yoke on it. I was told the 440 has around 450hp. Enough to propel an all steel body Duster with 4.10's, slicks, and a 4200 stall the Duster went 11.8 at 112. Now I am not going to be bracket racing my car but it will see Mason Dixon drag way once I get the car finished. It will get driven like a 440/4spd A-body should on the street. Any way can one of you with more knowledge than I chime in if I should buy a 7290, 1350, or I would be fine with the little 7260? As always all information is greatly appreciated:)

Robert