I think you should quote the bottom of the ad that states "weber carbs COMPLETE" and get your money back. If the carb bodies are busted then they are doorstops. In addition the condition you outline is not "good" but poor. It is difficult enough to get a pair of webers into tune with good clean rebuilt carbs, these could take you a long time and considerable cash to get running. If you can.
As far as I can remember a 70 911T didn't come with webers, they came with solexes. So there is no telling what size, emulsion tubes jets etc are in these things without chasing down each number with a weber parts list.
Do you have a 70 T? (as your moniker suggests) you may want to compare to what you have on your car now.
Anyway I don't want to be too discouraging but after you sink cash into a deal like that, trying to cluge it together and get it to work could be a great deal more frustrating.
I hate people like that.
Good luck, let us know how it comes out.
PS: chris below called it the t's had Zeniths...my memory is going...