Go to the top of the page and click "home". Then look for "articles" and click on that. Scroll down and you will see Mass air conv. under the tech articles. Much more complete info than what I would type in. Welcome to stangnet, there is some really good info here. I will suggest a book too, dont believe everything you read here. I have the Charles Probst book. Its in Summit and Jegs for about $30, great book.
I did a conversion about a year ago. If your serious about upgrading and mods then you should definately get one. It wasnt hard. I got a brand new motorsort kit off of ebay for 340. Ithink theyre regularlt like 520.