You will need to drill out/remove a few (i think 2) of the nuts that are pressed into the pedal support. Then drill another hole. The large center hole will need to be enlarged, kinda like a smile. The booster would depend on year (don't know yours) but there are two types. Midland (band clamp) and Bendix (twist lock) The Midland does not require a bracket, but the Bendix does. The Bendix rebuilt by Cardone (rebuilder for most stores) usually does NOT come w/ bracket, so in your case the Midland would be best. I personally like the Bendix (was used on 69 & 70's) Also get a NEW master cyl. ( I also prefer Bendix master cyl about $60)
Other things you will need: power brake pedal, brake switch, brake dist block and what some call Proportioning valve or Pressure residual valve. New front brake hoses among all the disc brake related items.