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just curious, if i read correctly, you can cause the lifters to
rattle when you wished to.
what do you do to make them rattle?
if it was run on a dyno, was timing and carberation optimized and
were any changes made prior to installing in the car,
like removal of the carb or distibutor?
is their any possibility something could have gotten into the intake
during storage or installation.

a lean fuel mixture or timing problem could cause a severe rattle,
i'm baffled by the bent valve and pushrod, any possiblity of an over rev.
a motor in storage will sometimes lose spring pressure on a compressed spring.
i would have thought any serious mechanical problems would have presented during the dyno thrash.
do you have any pics of the piston top and valve damage?
just thinking out loud, i'm interested in what you figure out.
hope you get her fixed!