8 3/4 SBP axles with 408 cu in???

brother in laws duster (73) had a herb mccandless 451 with a glide on a 9" slick with 4.30 gears and ran a best of 6.20 in the 1/8 mile on stock susp. good front end rebuild and go back shocks..that car had my stock 8 3/4 axles in thecar that was redrilled to big bolt patt. never a problem..lucky i dont know but that was about 5 yrs ago and the car is still going from time to time...