Wouldn't those longer push rods eliminate your .060" valve spring clearance? A lot of people bend valves quite easily without damaging the rocker arm studs. I think you have some extreme contact going on somewhere.result of my push rod checker. valve on the left has the checker set at 7.122 and this is what the gm part number # 10241740 as 5/16 7.122 inch long. the valve on right has the push rod that i got from chevrolet performance parts that describes as being 7.122 also but the actual measurment is 7.195 rods measured with digital caliper. the lash was set with top dead center compression stroke on #1 cylinder which is the one in picture and since my lifters were pumped up i made a half turn after zero lash. would you agree the pic on the left is ideal and the one on right is to long. spring coil bind is ruled out i have more than. 060 clearance
I bent some valves a few years ago when I tried to install my timing gears witout my glasses on. I got my squares and circles mixed up on the timing gear and bent the valves before it ever started. No damage to the rockers at all.