99 Silverado with stock 5.3

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I'll just move to a 3k then, i found the cam and springs on a website for 480 bucks, should i change my pushrods as well?

Always a good idea to change pushrods that have been in a motor for a while, Especially since you are going with a bigger cam. Better to eliminate variables now that could possibly cause you greef down the road. But on the other hand if they are fairly new, still in good condition, and the right length then it shouldn't be a prob.