I searched but couldn't find a for sure answer to my question of can you get a 90mm tb and keep the dbw?

 

Yes, the SSR accepts the 90mm LS2 TB

 

The problem is that the SSR manifold doesn't flow any better than the stock truck intake, so there's nothing to be gained by that route. If you think you really need a 90mm TB, go for the FAST intake or one of those aluminum Typhoon intakes on ebay and port the crap out of it. There are a few documented swaps on here if you search...