Jim G and Thor P (XR7 on this site) have used them. I have done some custom machining on the high riser intake adapters for those guys, so that they could use them with a custom sheet metal intake on a full-out race motor. Jim's engine made over 1000 HP on the dyno; picture below:
![](http://fepower.net/Photos/Posts/JimG01.jpg)
Here's a couple of pictures of another one that I recently sold, to a guy who wanted to use a 351C tunnel ram on his high riser engine. I don't know if he has it installed or has run it yet. The second picture shows the intake adapter in my shop, with my tunnel ram and carbs on it. Note that in order to use the 351C intake on the high riser you need the port plates to space the 351C intake up a little bit, to keep the ports lined up. You can see the port plates in the first picture:
![](http://fepower.net/Photos/Posts/RandyK3.jpg)
![](http://fepower.net/Photos/Posts/RandyK4.jpg)
Based on how it did on the medium riser engines that I've dynoed, I think that tunnel ram should make a lot of power on the high risers too.