I blew my engine about a month ago now. I finally had enough money to build a new engine for my mustang. I found the aluminum block at Downs Ford in New Jersey(thefordsource.com). They are on clearance for $450 + shipping. I am putting a cobra crank, manley rods and probe pistons good to 1000+hp. The block only needed 2 holes drilled at the rear main wall. They are .801" in dimension. Other than that, it is a perfect match. I will be adding my 3V heads, supercharger @11psi and a SFI flywheel. I should be very safe after this. I will add pictures as I put it together. Total cost for this build without labor, is $2019.