Bending push rods

[Willardstanley]

My 1970 428cj was setting for 20 yrs and i finly got her out and primed oil pump did everything right before firs start up etc . ran good for about 50 mils then bent push rod 3 of them to be exact !! So I replace all lifters and new rods now same thing hapend agen any sugustions on why it is doing this ? Stock motor arround 65 thousand miles 1 owner car , bad rockers ? camshaft . And cold I upgrade to roller rockers that are adjustable with original cam if it turns out to be ok ? oh yeah it has about 30 lbs oil preasure also