[alsriv2]

In my humble opinion, if your timing chain jumped, you have some serious wear and tear inside that engine. Unless the timing chain is seriously stretched and loose or there is badly worn teeth on one of the timing gears, it would be impossible for a SBC engine to jump a tooth. (there is no idler gear in a Sbc engine)

You indicated that the intake manifold was loose and you had to tighten it down. That could very well be an sign of a tired engine that needs to be investigated for overall condition. At the very least the intake gasket should probably be replaced due to deterioration from being loose. The last thing you would want to have is water start mixing with engine oil due to a worn gasket.

You have a very nice looking truck and I wish you the very best with your new adventure.