I'm guessing the SV either has a bad petcock or something clogging the pickup. It'll start (after a lot of cranking) and idle okay, but as soon as you crack the throttle it dies. The problems went away when I tried running the bike off my riding mower gastank, so it's gotta be somewhere in there. I tried applying some suction to the vacuum side of the petcock and it seemed to drain okay, but there's gotta be some kind of flow restriction...
I'd be happy to unload the GPz, but it's really just a parts bike... Looks like a decent naked project until you get close...