Lathe spindle bearing help

[tmoore4748]

So I've looked everywhere (yes, including our board), and have yet to get a good answer. Is it possible to replace bronze bushings for roller or needle bearings for a lathe spindle. I'm aware a lot depends on the lathe. Mine is the Atlas/Craftsman 101.07301. There's not much room for a regular tapered roller bearing without adding material to the headstock, which is cast, and I'm crap as welding cast, so I thought a needle bearing might work. Otherwise, I'll just rebuild the whole headstock to build it up the way I want it.