A friend of mine had a Holley Street Dominator on a 351W in a 74 F100. The engine didn't pull all that well until about 2700 RPM, but then it cam on real hard and pulled to about 6200. I had one on a 302 and it was kind of the same. At 2800 RPM it was like flipping on a switch and it had a really good midrange pull up to about 6000 RPM. It wouldn't bother me to use one again if I had a 2800+ RPM stall converter and wasn't planning on making power up past 6500 RPM as they seem to work good in their powerband even though their powerband tends to be a bit narrow.