Question for the engine builders

[longblue72]

I recently bought a truck knowing it had a knocking noise (halfway made the deal) and had some questions on if this idea works, but first here is as much as I know about it:

its a 350 with flat top pistons, has 1.6 ratio roller rockers in a set of brodix heads, and has a Howards cam with 580 lift.

The seller claimed that its a wrist pin knock.. however I spoke with a machinist who said that's wishful thinking.

This build doesn't appear to be all that old. If I find that a rod bearing, main bearing, or wrist pin is bad but all other rotational parts are okay, after using my better judgment, could i throw a set of correct bearings in place and rebuild the engine?

Thanks for the insight

Chuckie