No, the DART windsor iron eagle block has a 4-bolt and also uses some of the better design features of a clevland block (like smaller journal diameters to help with bearing failures) as well as other racing upgrades they designed.
http://www.dartheads.com/products/en...le-blocks.html
All the stock ford sportsman blocks were destroyed due to bearing failures and other heat and stress related issues. That is why we switched.