Trick Flow small block heads

Got ham...those are nice rockers. What is the offset? Can you mill the stands and use them on other than Victor heads???

So far this is the only ones that this can be done too for LA heads. This is because it has alot of material over the ports for a stand to be drilled. but the magnum heads I am working on them now. Not sure when they will be done because its a pet project for me at this time. The magnum heads are stud style rockers so makes it easy to do.