Don't worry, I did the exact same thing, but with the intent of doing a hybrid. I got a 1999 Taurus block with hopes of mating some SVT heads to it and calling it day. Then along came a deal I couldn't pass up ... free heads in exchange for some help ... 2001 Escape heads. I now have the makings of a full oval port engine. I sent the heads to kinger and now I have a head/block combo of pushing 400+ HP to the wheels.
