Rear end advice for racing with a 4 speed

I paid $150 for this 8.8 housing, originally from a Crown Vic. Lighter than the Explorer version, heavier than the easy to bend Mustang version, good compromise with 3" axle tubes. Cut the brackets/ears off it, narrowed it to 51-1/2" with some used 9" "Big Ford" ends I had laying on the shelf. Installed a new $700 31spl TruTrac, some used $00 Explorer 3.55's, plugged in some $500 cut-to-fit 9" circle track axles/bearings/lugs. Paid $40 for some spun Wilwood hats, $110 for a set of Wilwood rotors, used the same 4 piston Wilwoods that were already on the car. So basically $1500 total in parts.

Here's the 8.8 mocked up on the floor with a torque arm...



Here it is in the car with brackets added...



Ready to roll...



Before this, the car had a 10 bolt GM rear. Ran mid/upper 5's with 1.30 60's as far back as 2011 on some 28spl c-clip axles. Manual trans car, but the axles lived because it had a 'tamer on the clutch. Those 28spl axles never failed, but one did bend last year...



I don't think the 8.8 would have faired much better :)

Grant