Ford 9" in 1965 Barracuda...an option?
Some say those 8.75 early sbp rearends are too expensive, but by the time you get something else under there it will cost a lot more, won't look original, and basically will be more trouble than it's worth; if you can't do most of it yourself. An original sbp rearend without center section is probably less than a thousand; then pick up an aftermarket pumpkin with posi, cut a driveshaft; still under $2k..