Many months of sporadic research have not revealed a published flow rate for the injectors on my TB. I have am considering sending them to Witchunter Performance for cleaning (probably unnecessary) and more importantly, flow testing.
Sadly, it will run about $50 to clean and flowtest two injectors (or $30 for flowtest only) and return ship them, but that may turn out to be an investment in time and/or sanity saved.
I could save the money by robbing two injectors from Buzz’s old throttle body. They are known to be 245cc/min injectors. Preliminary experiments with settings on MegaSquirt, however, indicate a pretty low idle pulsewidth, just under 2 mS. Maybe I have something set wrong, but that’s not much margin below the recommended minimum of 1.7 mS.