They why bother changing from the stock cam?
If you want to try something, buy another camshaft pinion and broach several key ways in it. Then learn how to dial a cam in with a dial gauge and you’ll get pretty close to what the mega cycle cam is giving you. After all it is supposed to be identical to the original cam... just retarded a few degrees.
Ps. With the mega cycle cam you’ll also need to have your followers ground to 3/4” radius (stock is 1.25”)
I’m using the X12 cam... it’s ok but I’ve used other cams (less expensive) that pack more punch.