Drag Truck WINS Race! *and weight update

What kinda shape qualify as being able to regrind? I wish I would have known this 20 years ago I can't tell you how many cams I have threw in a scrap pile because they where a factory cam or a little rusty. What all can they change by regrinding it? I'm assuming the ls stays the same? I have a couple factory 318 cams in a scrape pile that I never hauled off but I'm sure they are rusty. The journals are probably unusable
I'm not a pro on it, but they can completely change the lift/duration etc. Not sure to what extent they can go