The last one I built with TFS heads I used PoP stands milled to the correct height for the TFS heads (have to email or call Doug to order - they aren't on the website I don't think) with PoP shafts, Morel lifters, Brent's rocker arms and I think Smith Bros pushrods. As luck would have it, Doug hit the stand height out of the box and I didn't have to shim them. Any quality rocker components are fine, just double check the set up - some will require more work than others to dial in.