1. Correct.
2. Correct. With a vacuum tree.
3. yes. with the correct vac tree.
Here's but one example of a vacuum tree. You remove the line into your intake and screw the tree in. Handy, dandy. Lots of fords had them if you're junkyard shopping.
http://www.ebay.com/itm/FORD-Vacuum-...item53f129d5c6