Go to
www.Webrodder.com and enter "FE" into the search. It will take you to a series of articles on several builds by the "Weasel" of 390's using the Scat crank and other options. A wealth of experience and knowledge in that series. I paid to get the entire set printed and mailed to me and it was worth it.
Read both the Ford FE Hot Rod articles and the Cobra Venom articles.
Good Luck.
Paul