Question about 1969 Barracuda

Colton Baker said
I was thinking of going to a mild built 440 instead of a 383 like the car had originally. But I haven't decided yet. If I decide to go to a higher horsepower application I'll definitely go to a Dana but as of right now it probably won't be anything too crazy

If it is a numbers matching 383 I would keep it. They bring good money.
As for the 8 3/4 I beat the hell out of a stock 8 3/4 suregrip with a very healthy BBM for 4 years with no issues. The rear end is still in the car years later running strong.