Nope, didn't get around to trying pre-root. Was too busy to get to it.
I had 340 rooted, but not custom rom.
I think i just got it to work though. I sbf'd back to froyo, rooted, installed the apps that weren't showing up in the GB market, adn then updated to rooted GB. It boot looped a few times. I did a battery pull and it seems to be OK now. I do have the persistent "sync" arrows that others have mentioned, but I can live with that for now.