To replace two rocker studs on your 67 Chevy c 10 350 can you the pressed in with screw without removing head?
No, you generally cannot replace pressed-in rocker arm studs on a 1967 Chevy C10 350 small-block without removing the cylinder head. The studs are pressed into the head, and there's not enough room to work with them from the top, especially to properly press the new studs in. Trying to do so would likely damage the head or the studs. Removing the head is the proper and safest method for this repair.