Cam button install help

That is a fairly healthy cam your engine builder stuck in there. Are you sure that is what you want? It is going to have a fairly rough idle and you'll be giving up a bunch of low speed torque in a 440. For a mild compression street build 440 I wouldn't use anything larger than the old DC .528 flat tappet. The cam you have is bigger than the .557 and is getting close to the old .590 flat tappet which was a bracket race cam in a 440.