rocker arm and push rod question

1.6 ratio rockers will tilt the pushrod over more than 1.5 rockers do. And can cause clearence problems. If you drill out the pushrod holes, you will enlarge the holes all the way around..and that will remove much of the ID in the pushrod dogleg (wall) area. This will limit the width of the finished port before breaking thru. You need to only open the pushrod hole in the front (adjacent to the manifold face) and the backside of the hole ( rocker side)and to not take any off of the sides. Good luck. Terry.