hey, and welcome to the site. there is a wealth on information on this site as well as others, so take your pick:
www.stangnet.com
www.corral.net
i am somewhat new to mod motors myself, and have found, that with enough questions and answers, the 4.6 is a completely different animal than the venerable 302. it lacks the torque of the 302, but it loves to rev.
the search button any of these sites work wonders. rather than post the same question (of which i am guilty of until i found the search button) such as what x/h pipe to buy, etc, just do a simple search for what you need. chances are, you will find it.
enjoy you new modular motor! you might like it more than your 302's!!!