That's what happens when you change up parts. Rockers from different manufacturers have different fulcrum points as well.
It is especially bad with a OEM hyd roller lifter and 1.6 rockers. I had to do a couple sets of heads opening the pushrod holes for hughes/crane/MP rockers. It is not a bolt on exercise and everything needs to be checked/clearanced.
That I fully understand. Had I known, I may have opened up the pushrod holes BEFORE the whole engine was assembled. Well, I learned two lessons. One about pushrod clearance, one about where not to shop.