Depending on what journal size you have, If you can find a wrecked Ranger with a 2.5, use that crank with some 5.7" rods. This is a far cheaper crank to buy than one from Esslinger or Racer Walsh. Though they do sell some great stuff. Also, Speedway motors sells some 5.7" rods that are reasonably priced.
2.3 Ford powered IMCA pro4