Larry Morgan campaigned a Pontiac Fiero powered with the Super Duty Iron Duke engine in Comp during his Sportsman racing days.
All the GM tooling was purchased by Kansas Racing products and you can still get the blocks and components to build an Iron Duke for racing.
Their block can be purchased with either a GM, Ford or Mopar part number and will accept different GM, Ford and Mopar cylinder heads.
http://www.kansasracingproducts.com/...cts/Notes.html