Below is more of what I was talking about. They are from $1200-1700 . More expensive than I thought. I dont know if you can get them cheaper. Cost of steel probably drove the cost of the blocks up.
http://www.fordracingparts.com/parts/part_details.asp?PartKeyField=6880
http://www.fordracingparts.com/parts/part_details.asp?PartKeyField=1927
http://www.fordracingparts.com/parts/part_details.asp?PartKeyField=2198
http://www.fordracingparts.com/parts/part_details.asp?PartKeyField=6880
http://www.fordracingparts.com/parts/part_details.asp?PartKeyField=1927
http://www.fordracingparts.com/parts/part_details.asp?PartKeyField=2198