The worth of a lbp SG 8.25 w/ 3.91?

I know what your sayen. I just don't think this 8.25 will stand up to the 360 once all together again. The motor has already blown a torque converter and tranny says the last owner. But what I'm reading is that $350-400 sounds like a fair price to set on this rear then I guess. I appreciate the help guys.