I am going to buy either a coast to coast body or a Ravon glass body. The Ravon I can order with a 3 " recess but the coast to coast only seems to have a slight recess. Check out this link

http://www.39ford.com/Ford%2032/gal_32.html

Will that be enough room for the 302 block or will I have to recess the firewall more?

The price on the 2 bodies is about the same but I would have to import and broker the Ravon body to Canada whereas the coast to coast is already in Canada and only would have to pat about $ 400 for the shipping.