The Iron Duke came in Fiero's, S-10 and many other GM products, and were all roller equipped by 1986, so finding a used engine core shouldn't be too difficult. We looked at this project a few years back, and determined the Iron Duke lifter was the way to go with this conversion, it was just the other components were the challenge. If you could just find even a picture of these parts, I can make them, and then the conversion would be completed.
