When the timing chain fell off (abrubtly) the valves were out of time with the pistons, hitting the pistons and obvioulsy bending the valves.
Just make sure you have proper spring tension and installed height for your new cam, I imagine you'll have to change the old ones out as years of heat soaking usually weakens them pretty good.
I'd upgrade the OEM pusrods with hardened units from FPP or any aftermarket cam company like CC or Lunati.
If the stock gears arent worn, just stick a chian on there, the OEM sprokets are hardened anyway.
Sounds like you have the rest coverded.
Goodluck, Cp