Well it looks like I am going to have to make my own bracket. The old box was held on by only 3 bolts. The 2wd's were held on by 4 I believe. So the bolt hole that is missing on my truck is the one you use to line the conversion bracket up so you can drill out the new ones. Plus I don't know how the conversion bracket spaces out the gearbox so that the back of the box clears the frame. Looks like it needs to be spaced out about a 1/2in. to clear. I'm going to incorperate that into my bracket.

"63 K10 chevy,406 mpfi small block, 350 trans, 33" tires.