i have a stock 200 hydro matic tranny in a 1973 camaro with a 350cid engine i know a turbo 350 will bolt right up but my question is will i have to change the driveshaft on it cause i dont know if the trannys are the same length i.e the tail shaft and all

 

You talking about the TH200? That was a v6 trans that came out in 1980. Or are you talking about the 200-4R? That one didn't come "stock" in your car, so if you have one someone swapped it. The 200-4R is pretty much identical in length to the TH350, and uses the same driveshaft too.