Difficulty timing a 1995 Chevy 454ci

Hello all.  It's been awhile but I can finally put to rest why this 454 ran so poorly.  My brother and I are currently doing an engine swap for his RV and we finally had the chance to pull the intake manifold... broken and bent pushrods everywhere.  A lifter was out of it's hole as well.  I'm not sure if a pushrod escaped due to bad lash, or a cam lobe wiped, or a valve got stuck but I think one rod got loose then started banging around damaging others.  I'm pretty impressed it was even starting on command.

The 454 we are putting in has no such issues so I think as long as I put everything back together correctly the engine issue should  finally be put to rest.  I am filming the process of engine removal and installation if anyone would be interested in that.