Looking for no BS info on 8 1/4 rears

I have the 8-1/4 in my 408ci Duster. I drag raced last summer with street tires and it did fine. However I could not get good traction with those tires. I am going to try it with street radial slicks and baby it off the line. It has the 74 or mid 70's axle and I put in an 87 gearset with 3.55 and suregrip. There was issue with carrier bearings being different on OD. Just have to get different bearing set with right OD (two sizes OD with same ID on bearing. I haven't found an 8-3/4 yet either.