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Old man is right. Figure out what rpm range you want to make power in and go from there. Cam/engine size and converter size all depends on the rpm range you desire.

Valve springs and pushrods are pretty much a necessity when doing any cam swap on these engines. Oil pump, timing chain, lifters and head gaskets are up to your own discretion depending on mileage.

DO NOT replace the factory rod bolts with aftermarket bolts unless you are tearing the entire engine down and having the rods rechecked with the new bolts. There have been more problems with spun bearings when doing this than keeping everything original.

The ls bottom ends are plenty strong factory and if you have an 05+ 5.3/6.0 I think they use LS2 rods and bolts which make them even more robust.
 
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