Sanderson Headers and 700R4 Transmission Questions!

[dandansuperman]

My truck is a 1970 Chevrolet C10 SWB. I am swapping my transmission to a 700R4 and could use any tips I can get. I went ahead and pulled the engine out too so I could repaint the block and clean up the bay a little more. What I was wondering is if I can put my new Sanderson CC10 headers on before I install the transmission? Someone said they are so tight you can't get the transmission in with the headers on the block. I am also quite confused about all the steps it takes to covert over to the 700R4. I know I need to get a TV cable and then adjust it correctly. What I don't understand is the lock up wiring. Do I really need this? Also, do I need a brake circuit swith? If there is anyone on this forum that has a good link to a 700R4 Install in our trucks let me know. I would like to see how they mounted their crossmember etc. Also does anyone have any idea how much the drive line needs to be shortened? I have lots of questions so I hope someone has some answers.