As long as they aren't actually rubbing then there shouldn't be a problem. It would be easy enough to mark them with a white marker or something similar, run it through a couple cycles by hand and check for any witness marks. I would be more concerned with proper rocker geometry than anything. Just being close to the pushrod tube isn't an issue. BUT having said that, make double sure you have the intake in the correct position for the distributor to slide in easily. You don't want to button everything up with the rods that close then find out the intake needs to be shifted for the distributor holes to line up correctly.