I would like to ask what cam specs are being used for 582 and 598 bracket engines set up for TBS 250 blowers. I have checked around for recommendations and there is a big difference in what was recommended.

Pick a cam grinder that you prefer, give the your engine specs and be detailed. Install the cam they provide where they say to install it and run it. Every engine is different, there is no set "spec" for an engine with a 250 blower. Someone can have the same engine size but due to some of the parts it might have, will require a different cam because of those parts.