Since hp is hopefully approaching 800 soon, Ford 9" is the plan.

What are the most reasonable places to look for it?

Car is basically race only, so spool is very much an option.

Thanks

 

I swapped out my 10 bolt (after I sheared 4-5 teeth off of the ring gear) and put a 9 inch in. I put a Moser engineering rear end in.Strange makes good rear ends too.I would put a spool in it like you said if you just plan on racing it.I have a Detroit locker in mine ,but I am taking it out and putting a spool in it this winter.You can contact Strange by phone 1-847-663-1701 or Moser at 1-219-726-6689.Hope this helps.

 

A "bolt-in" 9" for a third gen can be found at places like Moser, Currie, Strange etc. Typical price for a complete diff is around $2000. You can buy just the housing and axles for less than $1000 and put in your own third member if you want.

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and check out the race car

87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block (times are for the current engine)

Best ET on a time slip: 11.447 altitude corrected to 10.99
Best MPH on a time slip: 119.42 altitude corrected to 124.86
Altitude corrected rear wheel HP: 493
Best 60 foot: 1.586

Racing at 3500 feet elevation with a typical race day over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley